I give it to the group for Sidious alone. I get it that he is badass but Dooku is one of the best duelers in the galaxy, backed up by a crew all of whom have proven they can kill Jedi knights, in some cases Jedi masters. Sidious is awesome but there is a reason he doesn't just roll on mobs of Jedi every day. He knows that as a solo act he has to be a master manipulator. Add Vader to the mix and he has a decent chance of winning.