I found MP3 to be as fun and different as Gears of War 1 when I played both. 
Graphically it was good, they optimised so well that I never thought the game was lacking due to lack of horsepower even compared to other games where the difference is glaring. I think it comes down to how they made the things they had to do to make the game run on the Wii look like thats what they intended to do in the first place. Thats why im not so impressed with the Conduit screen shots as I was Res 4 or MP3.
Tease.







