There's quite a few quality titles unique to the Wii I enjoy, mostly lightgun shooters, so I don't know if those recommendations would suit your taste. If you're into retro compilations I'd definitely grab the Data East one, and the Wii has the best versions of Samurai Shodown Anthology, Metal Slug Anthology, and SNK Arcade Classics Vol. 1. The Wii shop has Alien Crush Returns, which I really enjoy.