When I consider the actions of previous presidents, whether they be Obama, GWB, Clinton, Bush, Reagan, Carter, Ford, Nixon, Johnson, Kennedy, Eisenhower, and so on and so forth, no, I don't think it is the least bit partisan to view Trump as being a lesser man in virtually every from even the least of them. I think you have to go back to the 19th century, perhaps Buchanan or Johnson, before you find a man less capable, and at least with Buchanan, you can argue that he was more a prisoner of circumstance than an outright bad president.
You see, partisanship means I dislike Trump because he's a Republican. I don't dislike him because he's a Republican. I dislike him because he's an idiot, and much worse, an idiot who thinks he's a genius. Even the likes of GWB and Reagan seemed sufficiently self-aware to understand their own limitations. Nobody asks for brilliance in a President, and some might argue that that could be hazardous in and of itself, but at least some level of understanding of the powers and limitations of the office, and the importance of each utterance for better and for worse.
Trump isn't one of the worst presidents in history because he's a Republican. He's one of the worst presidents in history because he's vain and stupid. It's my personal opinion that the stupidity is a relatively recent think, and likely a sign of cognitive decline; probably dementia. In all honesty, while I find Pence a pretty damned odious figure, I'd sooner have a sane evil man in the highest of all offices than Donald Trump. Evil can be dealt with, supreme arrogance coupled with jaw-dropping incompetence.
He is simply inadequate to the tasks at hand.