To collect the synopses in one place:

Episode 1:
Two Jedi attempt to resolve a brewing conflict between a peaceful planet and an aggressive interplanetary corporation, but soon see signs that sinister forces may be at work. After a long and ultimately futile journey across the galaxy to garner support for their cause, a final showdown defeats both the corporation’s military and their shadowy master’s powerful henchman. But the identity of the mastermind of these events and his true purpose remains mysterious…

Episode 2:
After an assassination attempt on a galactic senator a young Jedi is tasked with protecting her, while his master follows the trail of the assassins only to discover a conspiracy of galactic proportions and gets captured. Meanwhile the senator and her Jedi protector go into hiding and fall in love but when the young Jedi discovers that his master has been captured he flies to his aid and our heroes are rejoined for an epic final battle.

Episode 3:
Two Jedi accomplish a daring rescue of the leader of the Galactic Republic, but at the cost of the young Jedi’s conscience. As his master fights to end the galactic war, the young Jedi succumbs to the temptations of the galactic leader, who lures him into a Faustian bargain with the promise of power. The leader then reveals himself as the mastermind of the entire war, thus ending it and turning the Republic into an Empire. In the final battle, the villains are revealed, and the heroes flee.

I think the contractual survival of Yoda and Obi-wan is the worst thing about Episode 3, even more than Anakin’s confusing fall, since it paints them as stupid and cowardly. True Heroism and villainy don’t exist in this film since the characters are so muddled.