- last post: 01.01.0001 12:00 AM PDT
The biggest things, I think, are that there are no more flat backgrounds with painting-like qualities. Everything you can go out and touch. The other is that the sky is no longer painted-on, similarly to the backgrounds. It expands the box that you play in into an entire world. The flatness of Halo 2 backgrounds really bugged me.
Lighting, dust, and overall grit and shine is also a huge thing.