In great irony my guild is reforming in swtor.
We did go to WoW for a year but it didn't work out.
The game plays considerably easier than swtor which still has comedy requirements to get acceptable FPS with 16m raids.
The challenge in swtor is to get together enough people with good enough hardware to run a bad engine.
Hard to say what I didn't like about WoW, I suspect the feeling of coming into an extremely mature game as a total noob was poisoning things. Also the grinding necessary was really not cool.