My reason for hating cataclysm? The PvP wasn't that great. What's funny is, MoP is a worse expansion to me than Cataclysm for that fact as well. PvP is in the worst state it has ever been. However, PvE is in a great state hence the subs coming back and decent numbers, so forth. Most of the playerbase PvEs for the most part and PvPs casually, if it at all. The PvP playerbase has been dwindling, and or moving on to PvE as more of a timesink. In Cataclysm, the PvE was a bit lackluster and at the start, too hard for a lot of the 'casual players' who ended up hating it, and then it ended up too easy and the hardcore players wern't happy, etc. That's how I see it, regardless that I don't play anymore.