Not to troll here, but because its on the Wii. What do you expect? Even GT says the game takes 6-8 hours long with replay value and yet GT gives it only 8.5 and MW2 with only 4 hour campaign with no replay value and even the multiplayer was questionable and yet it gives a 9.5. Its just gaming journalism bias.
end of core gaming days prediction:
E3 2006-The beginning of the end. Wii introduced
E3 2008- Armageddon. Wii motion plus introduced. Wii Music. Reggie says Animal crossing was a core game. Massive disappointment. many Wii core gamers selling their Wii.
E3 2010- Tape runs out
http://www.fivedoves.com/letters/march2009/ICG_Tape_runs_out.jpg







