Nintendo has always had a much more lax policy of allowing third parties to develop software for its systems... so of course, there will be a lot of crappy games that you can point to on any Nintendo system...

for every Brain Age or Mario Kart on the DS, I can name 10 really shitty games for the DS...

the Wii is the same... for every juvenile baseball game or bloodless kiddie title you point to on the Wii, there are some fabulous gems out there that are every bit as fun and non-kiddie as you could have...

but that doesn't and shouldn't take away from how fabulous the Wii (or the DS for that matter) is...