Summary: I can definitely see the appeal of this game. It didn't do anything for me when I finally got around to playing it after picking it up on the cheap via a sale. To be fair I'm not a huge fan of other contenders in the RPG tower defense genre so its likely that its just not the type of game for me. Definitely can understand why others would enjoy it, but I would recommend anyone on the fence watch some of the gameplay before committing to a purchase.
Summary: You want to believe this game is good when everyone tells you it is. You want to. But it has fake depth. While you have the ability to play as many classes, it still feels boring as hell every time. Its not really fun unless you think grinding monsters for xp is fun. In which case, every game ever made is probably appealing to you.