There used to be a song at WHL about dreaming of a team of Robbie Keanes.
Leaving his personality aside, Keane was a great player for the club, scoring over 100 goals for the club, and in his prime had pace, good control, and a great shot.
Gareth Bale has pace, in spades. He has not just great control, but a bag full of tricks that he can pull out as needs. The step-overs, dummies, spins, etc are often overlooked in the focus on his speed, but they far surpass anything Keane ever produced. He has an incredible shot, placing it beyond the reach of the keeper time and again with either foot, from any range you care to pick.
Unlike Keane he can also score with his head. And he's big, and strong, and can ride challenges and hold up the ball under pressure. And he can cross as well as anyone in the EPL. And he can sprint for 90 minutes without running out of energy or enthusiasm. And he can tackle back without conceding. In fact, when you look at his defensive abilities it's almost as if he'd played top flight football as a defender. And he rarely gets injured to boot.
I honestly think that if you fielded a team consisting of one goalkeeper and 10 Gareth Bales then neither of the Manchester sides would stand a chance.