I played wow from launch until February/March of last year. Since then I haven't been able to pick it up again for whatever reason. I just started playing AOC and really like it so far. Here are some things that I like about it in to particular order.
So far everything is smooth
Devs release updates twice a week
It has a that new kind of feeling that wow lost a long time ago
Combat is actually pretty fun
the game looks good
Violence is cool
Sure there are problems but there are always going to be with todays mmo's. It seems like the only people who bash this game are either former or current wow players. Wow is a fun game but it had just as many problems in it's first year. Both games are fun but I'm burnt out of wow and ready to try something new.
I've only played it for a couple hours and watched my brother play, but from what I can tell, if they keep doing things they way they are doing them, this game will stay successful.