Everybody KNOWS he's good as Sherlock and that they SHOULD vote for him but feel like he's gotten so many accolades and so much fan love as well as huge sudden success that the "Tall Poppy Syndrome" suddenly afflicts them.
And this also informs why he gets passed over. It's almost like, "If he's so great, we'll still be impressed later, so let's give some of these other people their moment in the sun."
And, of course, one can't discount people who just think, "Fuck this guy, he ain't all that."