My experience!
I like to think that medicine is a course where intelligence is secondary to desire. I think my story sort of validates this notion. I like to think that I did reasonably well at school and academics in general. I fell into medicine, and in my first year realised I had quite little desire to actually go through with it. As a result my exam results were less than desireable, but something clicked over the holidays and made me re-evaluate and realise that medicine was something I actually did want to pursue. Im fighting an uphill battle at the moment, trying to get my habits in order, but am getting there. As thushan said, medicine is so much more about hard work, commitment etc than it is conceptually hard.
What really annoys me is the pedestal that other medicine kids seem to place themselves on in comparison to other degrees. They have some sort of superiority complex which I think is partly due to the isolation the med faculty has from the rest of the uni, and also the fact that a lot of the med cohort are quite naive, immature and sheltered. Med is their life. Medicine is not harder in any other degree to succeed in, yes, entrance might be slightly more difficult, but as has been previously said, its simply an indication of the passion required to enter the course.
xoxo