Just using Game Rankings percentage/no. of reviews - can't be fussed for individual reviews:
Big Brain Academy* - 70% / 29 (casual)
Excite Truck - 75% / 68
Mario Party 8 - 64% / 43 (casual)
Mario Strikers Charged* - 79% / 45 (casual)
Metroid Prime 3: Corruption - 92% / 21
Pokemon Battle Revolution - 57% / 24
Super Paper Mario - 86% / 53
The Legend of Zelda: Twilight Princess* - 94% / 78
Trauma Center: Second Opinion* - 80% / 51 (casual)
Wario Ware: Smooth Moves - 82% / 61 (casual)
Wii Sports - 77% / 59 (casual)
Wii Play - 60% / 42 (casual)
The ones marked with a "*" are ported titles. BWii, SSBB, Mario Galaxy, Wii Fit aren't out yet, so don't count.
I find the above is a pretty poor list of first/second party titles - that's my own opinion.