Kurt's one-and-only vocal performance ("I'll Follow You Into the Dark") is probably my favorite of the bunch. A close second would be Sam Tsui's Michael Jackson medley (which, as with all of them, is actually Kurt's arrangement.) I agree they'd make a cute couple, but I think Kurt claims to be straight. Not that I buy it necessarily, but that's what he claims. And I think Sam has been ambiguous about his orientation but I don't think he's fooling anyone
I like their version of Replay. I like Sam's runs, but I dislike his diction. It sounds like he over-enunciates everything he says.