I thought the CG was just jaw-dropping. I mean, it was far beyond the stage of "hey, that CG looks really good"; a lot of the time it actually looked real and it was difficult to tell the difference. For example, in a few of the battle scenes that had tanks rolling around, it looked like they'd built a real vehicle. Amazing stuff.

Is it because they put real time lighting over the top of it once it's animated? I don't know much about CG and how it's produced.