yeah, he's gay, and plays a gay character, but he can act straight too. In fact, he is an AMAZING actor. He probably has the best acting skills I've ever seen in an actor his age. I mean, he can cry on cue. In his scenes, you can actually watch the emotion on his face an the tears build, without any cuts. It's like, whoa. I can't get over how amazing his acting is.
Granted, he hasn't really played anyone except Kurt (angsty gay teen), and Artemis isn't as emotional as Kurt. But Chris isn't as 'stereotypically gay' as Kurt, and I reckon he could easily play a straight character >w<.
Kurt is a really emotional character, so it's hard to find scenes where he's not showing emotion, like Artemis would (wouldn't?), but he's done some pretty dark scenes in Glee. And he pretends to be straight and makes out with a girl in one episode, and pulls the straight chemistry off really well, so Artemis/Holly shippers wouldn't have to worry.
BUT ANYWAY, he would be perfect if he wasn't 20 >w<. He plays a 17 yr old though, and could possibly pass as a 15 yr old. And he totes has the face and pull the cold expressions off :3