He played in the era of the Steeler great teams, the Raiders were a regular team for more than a decade to go to the AFC Championship along with the Raiders, yes they were second best many years. Also Davis loved the deep ball Stabler was very accurate underneath especially to his TE's but Davis wanted to stretch the field, more picks. If you look at the receivers on the Raiders they were one big Stickum player. That era did not protect the receivers, the QB or anyone else, of course they would have more turnovers.
He won, he was a all pro like 4 times when it meant something, he won a super bowl, he was a league MVP also if memory serves.
He was a Russell Wilson type QB as far as finding a way to win and leadership, he also did it with his knees shot for many years because the league didn't protect QB's.