Well, James Newton Howard composed Batman Negins and King Kong, for example, Giachinno composed and won an oscar for UP.
And no, those songs that you posted are not more musically rich than the los soundtrack, they might be "cool" or "badass" but not musically rich.
That year other nominees were
Dark Void, music by Bear McCreary
James Bond 007: Blood Stone, music by Richard Jacques
Legend of the Guardians: The Owls of Ga’hoole, music by Winifred Phillips
Lego Universe, music by Brian Tyler
They definetly not looked at "mainstream only" games. I certainly can argue with you guys, but I can't argue with James fucking newton howard and michael the boss giachimo. I really can't.