It is all somewhat subjective. Nixon would probably be much higher on the list if it wasn't for a little thing called watergate. Clinton marred anything he did with blowjobs. I'm sort of surprised at the number of people thinking Bush's rating was too harsh. Just goes to show how divided this country is, and was, about Bush.
Though I don't understand the messiah comment, Denu? As someone who voted for Obama, I never knew people viewed him as a messiah! And I'm honestly not sure what I think quite yet- but I know his job is not easy and it's too soon to judge or criticize imo.
It's probably one of the more difficult shoes any new president has ever had to fill in history. I'll be curious where he ranks after 4 yrs as well. However, the confidence isn't listed as low actually. It's pretty much a three way tie as to top, middle, and bottom- leaning heavier in the middle. Personally I think it would be near impossible for him to land in the top 10. No one could possibly even fix the disaster that our country is in a matter of 4 yrs. Nor will he do it all to the publics liking, my own included at some point I'm sure.