http://www.gamebrink.com/nintendo-wi...n-reviews.html
It's a review, but it gives you insight on what to expect.
+Customizable Trainers
+Apparently Good Graphics
+Control it with the DS
+Online Multiplayer
-Just 'Stadium', no 'story' mode
I'm not concerned with it being 'too easy' or whatever, I'll primarily be using this as a multiplayer thing. The game shouldn't be more than $50 US, and I've certainly had games with fewer features that costed $50.