Untrue. Go to Siliconera and read my review of Bleach: Shattered Blade for the Wii. I was hyped for that game for months, as I'm a huge Bleach fan. However, I gave it a negative review, as it's not a good game.
Here, I'll link you right to it: Bleach review.
In fact, there have been several Wii games I've bought and disliked. Super Swing Golf, Sonic & The Secret Rings, Super Paper Mario, Zack & Wiki, and more. I don't think every Wii game is good. Far from it. But when I think a Wii game is good, I make it known. That's all.