CFTKK is a good start!!!
User Rating: 7.5 | SpongeBob SquarePants: Creature from the Krusty Krab WII
This is a really good start for the Wii. It's a game that will let you get used to the idea of game controls "outside of the box." Being totally new to the Wii controls, it can get a little too confusing when trying to attack 5 or 6 characters on the screen at the same time. This is a really enjoyable game for the kids and it doesn't seem to be too hard for 7 or 8 year olds. 5 to 6 may have a harder time with it. I'll say it's about two steps up from the Wii Sports game as far as controler difficulty.
I look at these new games for a new system and I call it a start and expect to see this system and games just take off and become even better. 
