Gentlemen...you can't just say, gee, what are the worst traits on their own, who has them, and then declare the worst leader. Analyzing traits on their own isn't worth much. Yes...in a game where you had no UU, no UB, and only 1 trait, you could rank the traits, with ones like financial and phillosophical being top tier, and expansive and protective being lower tier, etc. But the game doesn't work like that. The expansive trait, for example, might do little good in the hands of one leader, but be really powerful in the hands of another.
For example, take Washington of America. He's expansive/charismatic. These two traits are whatever they are on their own, but when combined they form an interesting syngergy. Or take Pacal of the Maya. He's expansive...not the best trait in a vacuum...but then look at his UB a building that gives +2 happy. So his +2 health combined with his UB allows him to build much bigger cities...and he's financial, so that means he can have a significantly better commercial output than you even with the same number of cities. Although if you held up philosophical and expansive and compared them in a vacuum, phi would look better, for pacal the expansive trait is actually really strong. Or take Victoria of England. The imperialistic trait is whatever it is on paper, but for her it really shines. Victoria is also financial, so what you can do with her is use the IMP trait to spam as many cities as possible, and then specialise. Turn some into commerce cities and some into hammer cities and then when you war and get those GGs, you settle them in the hammer cities so that she can build lots of highly promoted units, and her commercial cities are very profitable due to the fin trait.
Someone on here said Cathy was weak, with imperialistic and creative. I comletely disagree. Those two traits have a powerful synergy. Cathy can pump out rapid settlers in the early game and build cities all over the place, and then her creative trait pops the borders of said cities. She can easily grab the best land in the beginning and box you in with very few cities. And that also means she can grab metal and make sure you don't.
So think about all the factors and combine them when analyzing. Look at the two leader traits, the UB and the UU and think about how they work with each other. You'd be surprised at some of the things you will notice