I do think people overestimate the 'toying with' thing.
While he often lets fights drag out, that's not the same as being able to outsaber the other person instantly, that just means he has a way to end things quicker. I.e. vs Maul and Savage, the two really were holding their own in sabers when combined, it's just he could split them up with the force when he wanted and separately they were too outmatched.
So anyway, even Maul and Dooku vs Sheev would be a very dangerous fight for him, toss in Talzin as well and the result is clear.