What does Gary Sueism mean?

I didn't see him as dark in the first book, just desperate. For the most part he only resorted to violence when he was backed into a corner. He goes looking for trouble in the next book.

I too thought the Adem were a bit trite, but there were some interesting passages. I particularly enjoyed the "man-mothers" segment, as well as seeing Kvothe bested repeatedly by a ten-year-old girl.