Gears 2 MP is getting yet another patch to try to fix it if anyone is still interested
Here's a list of the
PROPOSED changes, nothing has been confirmed yet and they are still working on the damn thing
# Fixing chainsaw invincibility glitch
# Shorter duration for smoke grenade downing (standardized to two seconds)
# New levelling system that's experience-based rather than TrueSkill
# Five new achievements tied to the updated levelling system
# Only the host of a match will lose experience if they quit a game early
# Most recent shotgun shield glitch fixed
# Country preferences available
# Bots on Insane difficulty would replace players who drop out of matches
# Meatflag would no longer glitch off the maps
# Sniper rifle hit detection would be tweaked
# Two-piecing (consecutive double melee attacks) has already been tweaked on the server side and could see more changes
# New playlist options
# More fixes to address cheating
Its off IGN if you wanna read the original
http://uk.xboxlive.ign.com/articles/958/958474p1.html