Alonso finished 2nd in a poor car (at best the 3rd quickest on the grid, at worst 6th or 7th), and basically didn't make a mistake all year. He has to be #1.
Hamilton was quick, but was either let down by his car, his team or his own immature brain. Vettel was quick, but also had car problems and a couple of incidents of brain fade. So I think they're on a tie overall for 2nd (but I still rate Vettel as better).
After that it becomes a meaningless list of names in no particular order...