Skins was a huge disappointment in that regard. Especially since Alex's first episode was quite good, only to sideline him for the rest of the series. I wouldn't go so far as to call him a token gay - since he at least was allowed to be really gay - but he ended up being something almost as bad: The gay best friend.
Yeah, totally agree about Alex. I so fucking loved him when i first saw him, he is cute, crazy, funny...
But i think that's the advantages and drawbacks of the Skins' system. I mean they make 2 seasons with a cast because they want to be the opposite of US teenage drama show (One Tree Hill or others CW shows). And so they are, the rhythm is more dynamic. But finally they don't have enough time to develop all the characters and just when you started to like a character, you know you won't see him anymore.
Skins writting system (each episode focus on one character) is really frustrating. It was the same problem with Maxxie, we saw his boyfriend in a cut scene and that's all.
About Teen Wolf, for a moment i thought Stiles was gay and i wished he was, i really like Stiles.