Doing law at a very good uni, got good a-levels without really trying, got great GCSEs without really trying and I came second in a debating championship won by two people who are now both at Oxford... I'm not a genius or anything, but, yeah, I'm pretty smart.
I also usually get around 130-140 on IQ tests, but I don't trust them (being, as they are, bullshit) so I'm going to base my answer on my aforementioned achievements
I'm always a bit suspicious of people who base their claim to intelligence on IQ test scores
I have also been told I'm quite the wit and raconteur but I really don't know about that
One way in which I'm below average is that I have a terrible memory for faces and voices. well, not terrible, but I often forget people's faces and it takes me a while to recognise them. I'm also not good at following instructions. It's not that I don't want to out of some petulant desire to rebel or something, its just that I don't have a good memory for verbal lists. Written lists I can remember extremely well, but if someone gives me a list of instructions verbally, it just goes in one ear and out the other. Maybe I'm just too arrogant to listen to anyone else, which is definitely a shortcoming! Really, though, my biggest limitation is my attention span, which basically means I drift off and miss important information.
I'm also fucking lazy, which seems to be a recurring theme in other people's answers