I've played lots of those games and I always lost interest over the time. One had a bad community (nice game, really, but the other players were terrible!), one was too boring to continue, and most were just so random. I love the chance to customize my character, especially with pretty items, and I love pets. Some games just have an unfair money structure, which I truly dislike.
So, at the time being, I'm not playing any of those, but there are many new ones I'd like to check out some time in the future.