How does Dooku have terrible defence against blasters? Because KOTOR says that Makashi is bad against blasters? They just wanted every form to have a bad side and a good side, and Dooku is still taught in other forms, and has the force which still will tell him where the shots are gonna land....
And just a question. How would shields stop the force? Isn't that the same as saying a wall should stop the force, but it sure didn't when Darth Vader choked that admiral in ESB....