Well, I'd say Anakin's defeat of Dooku in ROTS was almost entirely about power and speed, and not technique. In fact, Anakin's technique in the duel is often telegraphed, sloppy, and overextended. Several times he just rears back and swings as hard as he can, completely disregarding technique. Anakin knocks Dooku off-balance with pure power more than once. It's not "technique" when you easily block my telegraphed attack, but my attack is so powerful it batters you anyway. I'd say Anakin's advantage is athleticism, powered by the Force. I don't think it was impossible for Dooku to beat Anakin as Django Fett said, but once Anakin gets mad and draws on the dark side fully, he just takes it to Dooku and Dooku was struggling terribly just to fend him off. I don't think Anakin was leagues ahead of Dooku, but it was clear that Anakin had surpassed him in power.