'Mace was the second most capable lightsaber duelist in the era when lightsaber dueling was at it's peak. As far as martial eras, you also understand that the most devastating war up to that time - the Clone Wars - were occuring.
So, no. I don't see this massive experience.'
1. Saber dueling was not at its peak during the PT era, but whatever.
2. You don't seem to understand how there is a big difference between a war between jedi and sith, and a war between jedi and clones. Bane would actually have gotten way more battle experience in terms of saber combat, that's a given. With the exception of sparring matches, Mace Windu faced what, about 10 dark jedi tops in his lifetime. Bane was in a war full of saber weilding opponents - he likely killed hundreds in the war alone.
'Once again... you have assumptions. Mace Windu was heralded as one of the greatest duelists that the Order ever produced. A lightsaber prodigy so skilled that he created his own lightsaber form. Vaapad was the hardest to master, and the most dangerous. Only he and Depa Billaba ever accomplished that.'
I'm not denying that Mace was a great saber duelist, but Bane was clearly a progidy himself. I mean he must have earned his reputation through some show of power, saber combat was his fort, I think it's safe to say that he was probably the best duelist out of all of the sith, and to think that there wouldn't be at least one prodigy in their whole order is just absurd.