i agree,aspergers in particular does seem overused now days in characters, even the UK hospital drama series; casualty has a character-a doctor who is definitely on the spectrum-this guy:
Casualty - Dylan Keogh - BBC One he also acts like a copy of house so i dont know if their attempt was to emulate autism or house, but casualty also has a nurse at the moment with bipolar, and it did have a character nurse with schizophrenia a while ago-the actor is now back in coronation street dont know her name.
casualty always glamorises conditions depending on the flavour of the month.
i agree with fridgemagnetman about bipolar, its so glamorised now,so many celebrities saying they have it but being very functional at the same time,you rarely see them crash and have a crisis like any 'normal' person, you never see them get put into an NHS/public pyschiatric ward,that is the reality of bipolar for many.