Personally, I think it's the map. Everyone hides in the brush which, makes it really dull I feel. Once you advance past that you get into the subway tunnels though, which is way the hell more enjoyable, but the park area is just downright boring as hell.
May as well go prone on a hill and snipe in that first area, nobody's going to be moving around, and if you walk past them in the brush then you'll instantly be killed. I'm just not a fan of sniping, personally I find it boring, much prefer running around with the shotgun flanking the other team and taking out the majority of them by myself. Which, I can do in the subway.
There is a good deal of glitches and server lag though, but that's to be expected in a beta! Also, that sucks that you can't form a squad with your friends, I was hoping to play this with some buddies.