I don't really view that as a lack of consistency from IGN.
They gave Uncharted a score pretty much smack bang on what it's Metacritic score is, then gave Resistance 2, a very love it or hate it game, a score that implies they were among those that loved it.
But I tend to agree with your future Metascores analysis, with two possible omissions. Super Mario Galaxy 2 and Zelda Wii.
starcraft - Playing Games = FUN, Talking about Games = SERIOUS