#1 - July 6, 2012, 10:25 a.m.
1. Transmogrification;
2. Archaeology;
3. Twin Peaks battleground;
4. RBGs as a concept (speaking of it as a general idea, without an insight into current balance issues, etc).
5. Some amazing world zones (in particular Vashj'ir).
6 (ADDED): Amazing lvl 1-60 leveling experience and Azeroth revamp.
These are the only good things there is. Worst PvP balance in history of WoW, worst ever patch in history of WoW (4.3), etc. But I wanted to be fair, so I can't just sit and listen to all day whining about how Cata is entirely bad.
I guess.. thanks Blizzard for Archaeology and Transmogrification. I wouldn't have much to do unless these things came out, regarding the current state of already mentioned Pvp. But at least I can dedicate myself to biding my time while digging for rarities and gathering various x-mog pieces for sale.
Oh, and thanks to these incredible guys who created NPCscan addon.