Yeah, I never got any zombie skills, partially because of that reason but also because I didn't die with my main character until I was almost maxed out as a human and it was during said Caiger siege so there were a ton of people reviving...I think. I may have died before that but I never really spent any time as a zombie.
I started as a Private in the military, and that was probably the easiest route to take. It took a while to get up the first 5 or so levels, but once you do the xp comes in fast (sharpshooting, shotgun skill, and things like that just rake it in). There were a few days where I'd make just retarded amounts of XP because my accuracy was as high as it could be and I'd luck out and kill a bunch of zombies in a shot or two because someone else had already done most of the work.
Anyways, the fun part once you got to a high level was some of the community interactions like people warning you of giant zombie hordes coming your way and the next time you logged in you were right in the middle of it. The Many was a force to be reckoned with.