Cataclysm sounds bleak as all hell. There are no adult-themed, apocalyptic-survival, zombie MMO's. You can get bits and pieces here and there but...
'Zombie' Games:
Left 4 Dead series, Dead Island series, Dead Rising series, Die 2 Nite (browser), Dead Space series, ect. (Anything with 'Dead' in the title)
Post 'End of the World' Games:
Fall Out series, Wasteland 2, Pikmin, Rage, I Am Alive, Lightning Returns, ect.
Adult-Themed Games:
Age of Conan... Umm...
'Undead' feature heavily in a lot of MMO's but that's not really the same.I think they call that Minecraft.
Off the top of my head... I think WildStar and Firefall:
- WildStar promotes itself as a skill-based game and with plenty to do outside of farming materials and dungeon-crawling. Like their player housing. Think farmville. You can have people over who can maintain your house and chase off pests for XP when you're offline.
- Firefall is more combat focused with their pvp and pve. I think most activities in the game result in a fight, like mining ores. They use a trinity system and you can switch archetypes on the fly (called battle frames), so you make a character and just switch classes at a station.
If you consider WoW skill-based, there are a lot of (illegal) private servers that have stripped the game down to just the 'essentials'. Otherwise... Dota type games? DoTa series, League of Legends, ect.
High fantasy? Everquest/LoTro. Interesting lore? Mass Effect. xD
I said that I wanted one, not that it existed. And there is no dismembering, beating someone to death with his own leg thing in Minecraft.
Wasteland 2 could be fun, duno It's not even out yet. And no I'm not interested in WoW, etc. I'm not interested in a MMO where I can't loot, skin, butcher players carcases.
I also don't want to play wurm online because its a grindfest.