As Popes go, he's great. He also seems pretty decent for a human.
As Popes go, the people who selected him are, for the most part, the same people who selected Benedict.
Doctrinally, I don't see Benedict and Francis as that different. The main differences I see:
- Francis is better at media relations and is more comfortable in front of a camera.
- Francis is better looking and Benedict is rather homely
I think those two facts alone contribute to a huge amount of the difference in perception of the two men. The media seems much more enamoured of Francis, so they're more inclined him to give him the benefit of the doubt and to interpret what he says in the nicest way possible (which generally prompts a bunch of Vatican PR people to say "no, no, that's not what he meant!" but this gets much less media interest than the original story).