Gameplay is decent but there are many bugs. Features often don't work, prizes often aren't awarded, and event requirements are often not stated, or not stated clearly. Much of the game is pretty to look at, and it's an interesting concept, but that's about all they have going for them at this time. There is a complete lack of support from mods and developers, and game and forum rules are not enforced. They also have a habit of taking unauthorized transactions from peoples bank accounts and refusing to return the stolen funds.
You can view my posts spanning several months trying to get a refund here :
http://community.gtarcade.com/post/index/id/41473/