I'm going to go ahead and say yes the wii is underpowered compared to the others. Now to be fair I'm sure Bwii and strikers 2 will be crazy fun. But that means I can pretty much forget about multisystem ports like assaisins creed despite the fact the controller would rock with it. It's a shame I would rather spend the extra 100$ to see the wii brought up to around the 360 or ps3.
So far red steel is the best looking wii game (graphically, game play wise it looks crappy). so for fun I'm going to put it to the test against mass effect and awesome looking bioware game that might push me to buy a 360 come 07(if it's better than kotor of course).