Sam Barks was the best thing about that number for me, I love how they've staged Eponine's part in that and Sam plays and sings it beautifully.
Aaron Tveit sounds good as Enjolras but for me his vocal was lacking a little firepower. Eddie Redmayne sounds great but the staging of his part was a bit weird, he didn't seem to be thinking about Cosette enough until the end when he's decided to fight!
The others I wasn't so impressed by - some of Amanda's notes sound decidedly dodgy although her acting was fine. Hugh's repeated 'One Day More' were painful but I liked the start. HBC and SBC seem to act the Thenardiers well enough but they're really not singers, and they haven't managed to edit one line Helena sings to put it in time with the ensemble.
Russell Crowe seems not to have given much thought to pacing and breaks at all, his lines are just run together without any real phrasing and I don't think it works - no particular words are emphasised, it's all samey.
The ensemble didn't sound too impressive either, though I thought the staging was fine.
I have heard that this is one of the weakest sequences in the movie though.