Ok so I played this 30 minutes ago my thoughts were:
1. The orb you can transform into and buy stuff and pick stuff up with is GAY, ruins the game in my opinion.
2. The graphics are nice, and most weapons are the same.
3. It seems the game wants to become more like a battlefield style shooter (big levels, many weapons, many people, many vehicles, etc). I just got bored after 30 minutes, and love halo games, getting bored was sad. Halo 2 was better imo, and halo 3 leaves me unimpressed
4. I played Skate today too, and it was much funner and left a bigger overall impression. If I had a 360, that would undoubtedly be the first game I would get. So much you can do