If you are aking about world opinion, I'll give you some. Clinton was well liked around the world. He and Blair, for instance, were/are very close friends. I don't think Dubya and Blair are all that close, in comparison.
Bush Snr was well liked. Regan too, in a lot of places.
Nope, I don't think internal US party politics has anything to do with it. I think people just don't like or trust him, or his brand of 'tough talking'. He certainly doesn't fill me much confidence as a President. Powell is 10 times the man he is, IMO.
Frankly, I'm amazed at the speed at which Bush etc have pissed away the goodwill following 9-11. That's an achievement all by itself.