For me it is all about fun if a game isn't fun I stop playing it. Last year I went back to EQ2 and it was a blast up to level 50 anyway, then it was way too hard to level.
I came back to WoW and tried everything to make it fun, I did tradeskills, a thing I had never done before in any game, I raided, I PvPed, then I multi-boxxed all these things kept me playing for a while. WoW for me is not fun it is a grind it is all grind for levels, grind for mats to raid, grind for gold, and now they are coming out with another grind to get to level 80?
I got 5 WoTLK beta keys the week before Warhammer came out and haven't played more than 10 minutes of it.
I'm playing Warhammer now and it is all fun at least until you get in an scenario with an ex-WoW PvPer and he starts bitching about losing but that has only happened twice to me so far.
I'm not saying I wont play WoW again and level to 80, my original intention was to play Warhammer 1 day and WoW the next day but Warhammer has been so much fun I can't go back to the boring WoW game just yet.