We also find out Padme is pregnant and Anakin begins having dreams about Padme dieing during childbirth. This is pretty much the last straw for Anakin
Paplatine realizes the war is coming to end and plans the endgame to take on his new apprentice Anakin. I love the scene where Palpatine tells Anakin
Its freakin epic and sets the tone immediately. Anakin ends up killing Count Dooku and this leaves only General Grevious in command of the droids.
The movie starts off 3 years after the last film and you can tell Anakin has seen some stuff. If you watched the Clone Wars series on Cartoon Network