gears 2 needs massive improvements. It was a great game when it came out but the bar has been raised a shit ton. (Gears 1 multiplayer sucked)
R2 - samething but I can safely say that it is a major step in the right directing after seeing gameplay and multiplayer.
Things I'd like to see
GeoW2
Better weapon selection
Better story
Better Multiplayer
R2
Better graphics
Smarter AI