Cripplingly lonely, but still too cool to spend time with the true outcast and not flexible enough to compromise by joining anyone else's activity. :/ *cough* I might have some issues with Carson.

I've seen it mentioned in fics that he *wasn't* a trauma surgeon or even a good surgeon,

I think that's a piece of fanon that has completely passed me by. I guess that would explain why, when Keller needed surgery, they called him in (it still doesn't explain why they haven't more than one competent surgeon at a time on Atlantis, but what can you do).