This is now getting my vote as one of the most underrated games currently in play.
Auto Assault has been developed by the same house which brought you City of Heroes/City of Villains.
1UP is sponsoring a 14 day trial right now, so check it out. Warning though, you need gobs of time and hard drive space to download the client. I assure you that the play is worth the effort. Give it a go.
Now if only I had an extra 15 bucks a month. Well, WoW has to end eventually, doesn't it?