I am also upset about the lag issue, I'm tired of getting chainsawed even though I hit the person square in the face with the shotgun (which if it happens to me, my head explodes, they don't even get downed by it.) The only good thing is they toned down the super power the lancer, but by doing so, made the shotgun overly powerful, which I was originally happy about, but now it sucks because everyone uses it.
Grenade tagging has also become overly popular. I thought it was cool at first and had the perfect setup for Blood Drive, now its just boring and irritating. Can never get the grenades because of freakin' lag and lack of cooperation from fellow players. There's always one person who ALWAYS has to get boomshot, one who ALWAYS goes to grenades, leaving me with maybe a torque bow if I'm playing with people who don't know the map well enough. (not really anymore, most people we play with are the ones who do nothing BUT play Gears...)
Overall, I was really excited about this game, and it was awesome, for the first week or two, now it is just irritating due to all the bugs still in tact.