I play Cataclysm for several reasons, but most of them are because I’m a nerd.
I’ve been writing zombie fiction since I was eleven or so, and have always loved undead. So, naturally, this is a great game for me. Cataclysm is good for story-telling, which is something I love.
I also worked on creating a zombie tabletop RPG for a while, because I found that so many zombie video games (RPGs in particular) are shit. (Dead state = hot garbage). When I discovered Cataclysm, a big hole in my life was filled. Everything I’d been trying to make into a tabletop RPG was (mostly) already here, mostly fleshed out, and with a pleasant UI to boot.
And finally, because I grew up playing Nethack and Angband and Omega and have a secret love for true rogue-likes.