I had Iron Man and it got a little repetitive after a few months. It's a really good game, but I think Metallica beats it by a hair in pretty much every category. IM is better for a large collection when you want something that will just kick your ass and keep you hitting that start button. Both games are fast and fun, but I just feel like there's a lot more to do in Metallica. The art on Metallica is also possibly the best ever on a Stern game.