Well... here ya go:
Episode One:
Sorry to say this film still needs its major conceit. ANH was save the princess. ESB was Luke becomes a Jedi. ROTJ was save Han and defeat the Empire.
The opening crawl should set the stage for this galaxy. It’s called STAR WARS, so we might as well be in Clone War I (thanks ChainsawAsh). The crawl should explain the war but it should sound like WWI propaganda. Remember that even though this is war, it should be part of the civilized age of the Old Republic of which Obiwan told Luke. The movie then opens on a large scale battle. The sequence should end with Bail Organa needing help. He tries a transmitter which is destroyed. In desperation he calls out (prays desperately). The screen cuts to Obiwan opening his eyes. He felt the disturbance (a mission from Yoda) and begins traveling.
Obiwan meets Anakin and Owen working on a spice farm on Tatooine. Owen works the land while Anakin is involved in transportation (navigator on a spice freighter, hey why not). Through some circumstance (I said it was a basic outline), Obiwan “sees” the force flowing through Anakin (cheating at cards maybe?). He requests the brothers join him on his quest on which he can "feel his master" sending him. Obviously, Anakin does and Owen does not (vocally). During their passage into the war regions, Obiwan will witness and be saved by Anakin’s flying skills. They should become friends and trust each other with their lives. Obiwan shouldn’t be condescending and Anakin shouldn’t be a crybaby.
Obiwan should be a very by the book, in control Jedi. Anakin is reckless and when in a pinch his anger makes it worse. Anakin should be the Han Solo of this trilogy. Obiwan tries to teach him to control it, “I was like you once, but there is a better way.” Obiwan wants to take Anakin to Yoda to be trained when this is over. Anakin is impatient and pleads with Obiwan to teach him now. With his ego stroked, Obiwan decides to begin his training. The movie should culminate in the two friends learning from each other: Anakin learns to focus and Obiwan learns to be little reckless.
Whatever the major conceit of the film is, I feel it should lead to the end of Clone War I. Maybe they are given medal by a nice little senator. It should be a joyous ending like ANH.