Gunstar Heroes is a simple action shooter that is fast and explosive. The main draw of the game was that you could play it co-op and beat it in roughly an hour and half. It's got some fun, crazy weapon combos (you get to have two weapon elements at all times, and there's eight or so combinations) that keep you on your toes. Each level has a crazy thing about it (an awesome sled-tunnel level, a cool level where the ground inclines down and you slide the whole way, another where you climb aboard an airship and fight a guy on a helicopter). The bosses were pretty sweet and some incorporated 3-D graphics of sorts. Pretty much, if you have a friend to play it with, it's TOTALLY worth 8 bucks. If not, ummm.....DON'T download a ROM and try it...
I think it'll work great with the GC controller, not sure if Wii Remote functionality will be included. Of course, the Classic Controller will likely be the best, but I'll give a full report once I've tried all the options.