killzone 2 was good but now i have been on killzone 3 the input lag is really noticeable to me but like you said the medic had a better gun and med packs which i found really helpful .
Yeah, I'm afraid I've given up. The lag is horrendous after playing KZ3 and I haven't got the patience to flounder on with KZ2 trying to unlock the classes. The maps aren't that interesting - they're HUGE which means it takes ages to get anywhere and they are all dreary and dingy.

I'll be buying the new map pack tomorrow and playing that instead.