Oh, you two.
First, there's no evidence to suggest Yoda would utterly pimpsmack Dooku like he would, say, Ventress.
Second, Dooku is not Yoda's equal. He is not close to Yoda's equal. The fact that he struggled in some respects to subdue Ventress elsewhere (TCW) but on Vjun could fell her by simply lifting a finger points to a significant power boost while there.
Third, Dooku's previous fights are inconsequential when we know courtesy from the ROTS novel that he, as SIDIOUS66 pointed out, is very efficient in using the Force to scatter his fatigue.
Fourth, Yoda's relative ferocity in fighting Dooku versus fighting Sidious is observable. In the Force fight with Dooku, Yoda only attacks once, and deflects the rest. He's clearly reluctant to clash swords with Dooku because of their history, as is said about Mace in Shatterpoint. In his duel with Sidious, he's constantly trying to go on the offensive and in pursuit, both with his lightsaber and with the Force.
Now, I realize it could be worse, but I'mma slap you both.