Yeah, must admit, I am getting some lag spikes because of my video card. I have to play a lot more stealthily on the Conquest maps... well, I try to play a lot more stealthily... well, elephant stealthy...
I really like the squad deathmatch games too. There isn't as much going on graphically in the background to make my PC struggle.
Sometime soon I'm gonna try the Rush game, but I would hate to be the n00b in a critical situation... maybe that's something we could all have a go at together as I'm still on a learning curve with this game.
On the point of video quality, I found that I wasn't getting more or less lag when in medium or low settings. I can't use the x4 scope I earned in either... just that split second lag gets me killed every time. So, I keep it in medium all the time now and just don't put myself in situations that call for cat-like reactions... which isn't easy when assault.
Just be a nutter... life becomes much more exciting, and people won't expect anything more of you...