Wow. This was a great movie, and although I can understand a lot of the criticisms I've heard (especially since, I went into the movie already understanding much of what it was going to tell me, so it was easy to grasp all of the business jargon because I'm used to it) I respectfully disagree in my case.
I loved Adam McKay's style, it was tight, claustrophobic, and the editing was very tight. My favorite film, from an editing stand point, of the year. The ensemble is fantastic, and it's material that any other director (who didn't know what they were doing) could have easily made it all become disjointed and confusing (even to those who understand the jargon). He always kept the film moving, which for some might be a problem with how much information is packed into it, however that worked great for me. There were hilarious moments, there were insightful moments, and there were moments where your stomach shrunk in horror of the fact that this actually happened (like the film continually reminds you).
I really liked the breaking the fourth wall, there were a few moments where it didn't work as well as it should have, but I thought it was very needed, and it made the film feel very fresh and different. The style felt innovative, and I thought the close-up, documentary-cinematic hybrid worked brilliantly.
More specifically on the ensemble, I loved Carell and Bale, both of them are standouts and some of the best performances of the year. Both deserve nominations, and I honestly think Bale deserves to win the thing. The performances feel like real people (aside from Gosling, which is on purpose), it feels as if Ryan Gosling is actually giving you the inside scoop on everything that happened. It doesn't feel like you're watching a piece of cinema that McKay has put together, it feels like your watching real events. It's done so well that it makes the impact of the end hit even harder.
I went in this film with high expectations, it looked right up my ally, and in many ways this film exceeded all of them. Really, really loved this movie. A+