TC: A-A good, full pic. Even if it strays from the main theme it sure hits the eye more(personally).
PM: A-A full pic, period.
WW: A-Pink with a Wario face makes me think fun funk whereas Yellow is Wario's color so it doesn't hit the game's meaning and both grab the eye alright, pink is a bit more whacky though.
RS: E-Silhouettes suck, the design is an attention grabber over Es though, look at it from an artistic veiw, the balancing isn't as obvious as the Euro one and the structure is a bit more interesting, the colors go better as well although they're richer in the euro one, the blood splatter is nice but the random yellow put me off. The A structure overall is better but E has a bit more detail.
WP: A-It has good structure.
hiya all i made a voting template for you at the bottom
of OP
A=American one is better.---E= European one is better
Deweys adventure = E
Mario Strickers = E
Resident evil 4 = E
Warioware SM = E
Trauma center = E
Rayman RR 2 = E
Paper Mario = A
Red steel = E
Wii play = E