I don't know if it's a good thing or not that he can play a gay character so well, but he did a good job (another example of this is his character on 'BtVS'). I found his portrayal amusing if anything. I found the sister character really annoying and I was rooting for Tom the whole way.
The plot was rather basic and we've seen similar things a million times before, but hey, it's something to watch when you're bored. All in all, I'd give it 6 out of 10 just for Tom Lenk's performance.