Contagion. Most other disaster movies sacrifice scientific accuracy for drama or action (Twister; Armageddon; Day After Tommarrow), but Contagion found an appropriate balance. I also liked the choice of actors- everyone seemed perfect for their role-, and the lack of typecasting made it seem all the more real. I loved it.
I did like 2012 when I first saw it. Cheesiest thing ever, but it looked cool on the big screen. And Deep Impact was a good one as well, despite the fact it makes no sense that they would only see the comet 2 years before impact. But if you can get past the technical stuff, it's a good drama.
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I Like Trains.