Some "definitions" of key characteristics here: http://biteyourownelbow.com/keychar.htm
None of it bothers me, besides the "kick up the backside" moving the key up a semitone or a tone can sometimes do to a song. Keyboard player complains about "too many black keys" sometimes, but plays it anyway Keys mean little to me the way I compose, which usually consist of me finding a riff on the bass in a random place, retrospectively working out the key and the chords, trying to make a vocal melody over it, then shifting it if the singer ends up bottoming out on his range.
It's probably completely the wrong way to go about it, but songs seem to come out the other end, so does it matter?