I held out for two months, thinking it would be a bit too simplistic and not worth the 15 bucks, but I'm really digging Pokemon Rumble. It's as addictive as X-Men Legends, except that instead of new items it's just new Pokemon. Not really a leveling up system, either, but the constant unlocking of higher level Pokemon keeps me coming back. I also like the look of the "Mii"-ized Pokemon. (If that was the aim.)

I have Pokemon Rumble. It can be surprisingly addicting

I've only played the demo version of Pokemon Rumble and it's quite good for a Wii Ware title. I rather like the fact that the Pokemon are dolls in this game, and that they don't level up and whatnot. If I could, I would buy the full version.