Carolyn:
I'm surprised that the question of accents has been such a big talking point. It seems to me to be such an academic point given the brilliance of the storyline, filming and cast. I have heard it suggested that it should have been performed in Spanish with subtitles, I'm strongly against that opinion. If the film was purely aimed at the art house crowd then perhaps it would have been viable, although I would suggest that many of the art house film goers will be too busy arguing whether Dali and Lorca ever did get as close as the film suggests to worry about the language choice. Of course filming in Spanish would have its added difficulties in that if you're going to be such a stickler for accuracy then the regional accents and dialects should be right too. For example, A man from Madrid playing the Catalonian Lorca would be like having a Texan playing a New Yorker.
I truly believe that the aim of this film was , whilst staying faithful to it artistic design, to tell a story to an audience wider than that who would normally make the effort to see it. That just wouldn't have been achievable in Spanish with subtitles.
I think that the only time where the use of Spanish is necessary is in the poetry as you can only get the true flow and rhythm of a poem in the language it was written in. In my opinion they handled this brilliantly using the original Spanish and overlaying it with the English so that you knew what it was saying whilst still getting the melodic beauty.
The accents were good enough for me to know they were Spanish, did they need to be any more?

Wendy:
I think this review had two main points. The first I believe I dealt with in my reply to Carolyn's question, so here I'll look at the second part.
“I felt that more time could have been spent developing the characters, especially Dali, as I didn’t feel that I particularly learnt anything about any of them and by the end I didn’t have any emotional involvement with the characters and their actions were often poorly explained. Having said that, the film still felt slow and it didn’t entirely hold my attention. The time line seemed confused as it moved quickly through a period of almost 16 years the plot also assumed prior knowledge of the period and characters from the audience.”
I must admit that when I read all of this I was a bit stunned, this person and I couldn't have been watching the same film! I went to see this knowing little about Dali beyond his painting, I knew nothing of his life. I had never heard of Frederico Garcia Lorca. I left the film feeling like I knew them, perhaps not a completely faithful account of them as the film never tries to be anything more than a speculation, I felt for them, I cried for them. I also sympathised with Margarita whilst at the same time admiring her for the strong woman she was.
Dali develops wonderfully, from a gauche young boy he changes himself to be more like Lorca whom he idolises from the beginning. As their relationship progresses Dali becomes more and more dependant on Lorca for support and reassurance and through Lorca he truly begins to believe in his abilities where before he only talked of genius now he genuinely feels it. When in his confusion he cuts himself off from Lorca he retreats under a veil of eccentricity and forced self-importance. Finally with the death of Lorca the light leaves Dali's eyes and life becomes merely a stage. How could this not be development?
I don't think their actions were poorly explained, they didn't lay down clear cut logical reasons behind their actions but who of us ever has clear cut logic in everything we do? I think the lack of logic made them all the more real, everything they did screamed of inner turmoil and the constant fight between heart and head.
I entirely disagree with that review and I think I can speak for the people around me too who were laughing, sighing and gasping with as much feeling as I was.

Lucia:
I almost included the scene in the sea as one of my favourite but I chose the bicycle/beach scene instead.
Whilst the quality of acting is remarkable throughout this is a scene where the genius of the filming takes centre stage. It begins with a dark cloudy night with Dali and Lorca jumping out of a rowing boat into the ocean. It's so dark they can barely see each other, but then the moon comes out and the whole scene is transformed, both characters look ethereal in the moonlight. The filming follows them as the twist around in the water, it films them from below and above until you can barely tell who's who, in the same way they feel themselves becoming one they become one in the eyes of the audience too.
Under the moonlight they share their first kiss, all pretence dropped they are entirely themselves. It is one of the most romantic scenes I have seen. When it cuts back to the scene later in the film there is a powerful feeling of longing for the simple beauty which they shared that night, one which they both know they can never return to.

I've also seen some people mentioning the nudity and sex scenes so I wanted to give my thoughts on that.
The nude scene of Robert Pattinson in front of the mirror is one of the moments where Little Ashes attempts to inject some humour into their sensitive and serious subject matter. They are very successful in these attempts, I laughed several times and so did the rest of the cinema. It would have been a mistake not to include some humour in the early half of film after all these are young people at university living life to the full all of them large characters with immense belief in their own ability, it would have been hard to believe there wasn't frivolity and laughter, it just makes the later sadness that much more poignant. My point is that Pattinson fans shouldn't be expecting sensuality in this scene that's not what it's about.
The sex scene is secondarily about sensuality and it is there, but it is a magnificent scene because the sensuality comes second to the acknowledgement that each of the three characters is suffering in their own personal hell. Dali's eyes are filled with tears and he struggles to understand his powerful reaction to what he is witnessing, Margarita is finally getting the man she wants but feels like she is being used, a toy in someone else's love affair, and Lorca hates himself for using a woman he knows loves and respect him to express his love for another.

I hope this additional post answers some of the things you wanted to know. I'm sorry if I gave away more of the plot than you would have liked to hear.
Also I love comments, whether critical or nice I appreciate them all! So please say what you're feeling on this or any of my other posts!

ADDITION:
Ruth
I have heard people commenting on the accent slip. I did recognize it but I took it to be entirely intentional. At the time Dali was meeting Lorca after 8 years of seperation. He was being pretentious, he grew a ridiculous mustache and at one point spoke in a very convoluted British accent. It was not Robert's normal accent I assure you so I can only assume it was purposefully done, it made perfect sense within the context for me!
There was a moment when I thought the film had ended, and I remember thinking "now I'll have to go home and find out what happened next" so there will be no complaints from me on the final scenes. Whilst I would have still loved the film, I definitely wouldn't have cried or felt quite so emotionally attached as I did if the film had ended earlier.