IMO Manuel is the GOAT male performer, but not necessarily because of his performance but more how the girls have chemistry with him. Sorry if this pisses off some fans (the pervious sentence probably also pissed off those who don't like him lol), but I think a lot of it has to do with how he looks. He has that classic male handsome look. It is very rare for porn stars. They are either ugly (very often) and /or over macho and a bit beastly, tatted up etc. Or they are tall and handsome but in this pretty boy male model way and look a bit gay, and many actually did start out doing some gay work, which can be a turn off to some girls. Then you have the James Deen types that appeal to certain types of women but are a bit small and inoffensive looking, lacking that masculine element.
Manuel strikes a good balance of everything and he's the only one that I think is handsome in that classic matinee idol sort of way. The worst you can say about him is sometimes he is chubby.
It's the fact girls are so attracted to him that brings out the performance IMO. Not so say he isnt talented or doesn't fuck them well, but I think that's an underrated dimension of it.
His dick is big, and particularly thick, but for porn it isn't out of the ordinary. Same with his body which can be a bit flabby or jacked depending when, and he is reasonably tall but not very tall. It all boils down to the classically handsome face. He is not on the level of looks of a Brad Pitt or George Clooney, but far above the vast majority of other male porn stars present or past. Of course if his performance was bad or his personality and attitude lacked, this wouldn't matter, but since he is good in those areas when you combine that with his looks, it is easy to see why girls like him the best and he brings out the best performances and scenes.