That's PIS; in such a fight as this, neither Dooku nor Maul would be awestruck by Sidious, and their reactions to him are pretty much moot. They don't reflect accurately on his power in comparison to their own. Dooku has shown considerable force mastery and exceptional saber mastery, as has Maul. Together, they can do this.
This is assuming they can work together for a minute. Maul, upon the slightest suggestion Sidious wanted to replace him, has been thrown into killing rages against his enemy and Dooku had nothing but contempt for Maul. Sidious's force mastery surpasses the both of them and he's far superior to Maul, as well as knowing all his moves and skills. Dooku's damn good, but Maul'd go down in moments and Dooku has no chance