I wouldn't consider my k/d to be low right now. I'd say it's around average, maybe a little better from what I've seen. My k/d was at 1.13, and that's because I have a bad connection, and before Anniversary and the Anniversary playlists came out, me and my friends played mostly just Living Dead. Because of my connection, after I get the kill-shot on someone, it still takes about a half-a-second for them to die. That isn't a big deal in the Anniversary gametypes most of the time because there's little they can do with a half-a-second to spare before they die.
But it matters in SWAT and Living Dead. It's why my k/d with the shotgun is so low; the zombies move so fast and you have to be pretty close to the zombie to kill them with a shotgun in the first place, but with that half-a-second to spare... Well, it makes me the King of bulltrue-deaths. Ever since Anniversary and it's playlists came out, me and my friends have been playing predominantly that, and so my k/d has been rising pretty quickly. Right now I'm at 1.19.