In order of importance:
1. More realistic engine with better movements and varied gameplay, instead of people going down the tape and chasing the last person while they are at point blank range and keep missing eachother.
2. Party System (like Halo 2)
3. Customizable Fields!!! (and share them with people online)
4. Customizable Guns and gear (Color, Milling [maybe], etc.)
5. MORE GUNS MORE GEAR!!! (Take out the fake guns)
6. Better models
7. Customizable characters with your face on it (Like thps:underground)
8. Realistic stats of guns and gear (one gun is not more accurate than the other
)
9. Video editing mode/mix tape mode
10. Polish polish polish