It's not perfect, but like I said, they weren't totally clueless. Otherwise a Philosophical/Industrious leader would exist.
Complete nonsense. ORG/PRO doesn't either. PHI/IND is often thought to be "overpowered", but it's never been shown and frankly, Firaxis wouldn't be able to show it even if it were. PHI/IND with average UUs couldn't touch what civs like Inca or any of Rome/Egypt/Persia on marathon can already do. It's only even materially better than most "good" trait combinations if you assume normal speed, high-level immortal or deity with tech trades on...lots of assumptions just to make a trait combo "seem" overpowered. It wouldn't be trash tier in MP but it certainly wouldn't run away with any games consistently either. There was and is no reason to avoid including it other than that they simply ran out of leaders they wanted to throw in.
CHA is mid-tier. Exp is definitely above average, but IMP can't justifiably be considered an "above average" trait unless you have a map for city spam, and some means of affording that...and Joao's uniques are AWFUL in a majority of cases (feitoria is always awful).
The UB is all HRE has, and it's not enough to compensate an otherwise junk civ.
Sally isn't much liked because of PRO, otherwise his stuff isn't that bad..
Only good thing about Sal is his 2nd trait. Madrassa is OK but rarely important outside of AP games, while the camel archer is a marginal upgrade over a knight (certainly nothing like the cataphract). Even his starting techs are somewhat grating.
As long as SEALs, Panzer, Ballista Elephants exist gallic can't be among the worst UU, but they too are rarely a major factor in SP simply because swords aren't so hot in the first place. They're more average, although the celt UB is underrated to a degree since it opens up some rather obnoxious nonsense and lends some aid vs hill cities on occasion (Duns can impact muskets and grenadiers too). I couldn't vote the dun behind late game UBs like Mall/RI/Assembly Plant. I thumb my nose at much of the community and say that on more maps than not I'd take it over the dike

.