If you look at the results of the poll, you'll see what the problem is with this kind of question is. The majority of people rated themselves as "above average" statistically speaking, assuming a normal sample, that is impossible. If you search hard enough then I'm sure that you will find something about yourself that is slightly exceptional, but no matter how smart you might think you are it doesn't change the fact that you aren't being realistic. Even now, I'm sure that many of you reading this are saying "yeah, those other guys are messing up the results!" which only serves to prove my point: that humans, for the most part, simply can't be trusted to self-report things about themselves.
(Also, sorry for any spelling/grammar mistakes I made, I'm typing on a smartphone, and autocorrect is a cruel mistress.)
(Also, sorry for any spelling/grammar mistakes I made, I'm typing on a smartphone, and autocorrect is a cruel mistress.)