Not as gifted ? Bane could move so fast, raindrops couldn't hit him in a rainstorm. Couple that with his sheer physical strenght, and he'd be MORE than a match for Vader. Especially with his obelisk armor. Also he was much wiser than Vader was.
He was arrogant. He was buried beneath rubble, unable to move. Had they chosen to end his life, he would've died right there. But as I said, Arana gave Vader an opening before, and the 501st saved him.
Worth mentioning that one of the Jedi assisted in their own defeat, and Vader was wounded several times by them, even crying out in pain before he surrendered. If it wasn't for the Jedi Arana killing a fellow Jedi before he tried to murder Vader, Vader would surely have been taken in. He was also subdued and buried by a telekinetic assault and beaten before the 501st stormed in and practically gave him the win.