It took THAT long for Mario Party to be mentioned?!?
Mario Party 8 is fun as hell…9 (IMO) suuuuuuuucks. But even if you would go back and get original Mario Party games via the downloaded section they are really fun.
WarioWare Smooth Moves is great. I was in my late 20’s when it came out and had a blast with it. It’s been a long, long time since I was 7 but I’m pretty sure I would have loved it back then even more.
“Xenoblade Chronicles” is one of, if not the best, rpg I’ve ever played.
It’s a must for the Wii.
Second for Okami. It’s my favorite Wii game.
This game is a huge hit with young kids but does get expensive. If you can find someone dumping their collection on Craigslist it would be worth it.
Just be warned that all the newer ones are mostly luck-based.