It's not THAT bad!
however, the glitches and uneven frame rates made my experience a little bit frustrating.. helghast soldiers suddenly popping out of nowhere were really irritating and i can't even aim properly thanks to its lousy frame rate.. i died a lot in this game.. 50 in total..
all in all, it's a fairly decent game.. i've played better FPS's but this one deserves a chance to be played..
can't wait to buy Killzone 2.. :)