Star Wars 1977
The Empire Strikes Back 1980
Return of the Jedi 1983.
The rest of the stuff is just add on material to me its no more canon star wars than any sort of expanded universe material. Which would include the 1997 and 2004 butchering of 3 classic movies, and those prequel movies.
The elements are their in a sort of static form in the prequels but were not fleshed out. The success of the prequels hinged on the characterization and portrayal of Anakin in episodes II and III, but ultimately what we got was a bad performance and rediculous point a to point b in the script and utter nonsense and the turn to the dark side made no sense. If the reason to go bad was to save his wife why is his first act to kill her WTF?
She was Pregnant with his child/children and he goes to choke her to death, i'll save you by killing you,lol.
If Hayden's inability to pull off a performance was bad enough with no help from Lucas and the greenscreen backdrop, Padme dies of a broken heart was the most dumb thing ever.
Episode II was just plain bad but revenge of the sith invalidated return of the jedi. Therefore i must pretend it was not a star wars movie.
Also it makes no sense why he would not kill the emperor for tricking him into such an alliance if his wife died why stick around with Palpaptine. I would have killed the bastard when i woke up from that operating table and heard him laughing about her death. Oh other than the fact that it was in the script for the other three movies to happen but dramatically it fails to work.