In my opinion the prequels are the worst of the expanded universe by far.
George Lucas can call them canon until he is blue in the face and it does not make them canon just because he says so.
They don't match up with the oot the one and only true star wars canon.
I would venture even further to say the prequels are not just EU but an alternate universe continuity, for example Hayden Skywalker/Vader does not match the mentality of the original star wars trilogy, nor do the jedi. It is Star Wars in name only sure you have these dudes in robes who have the same names and carry a lightsaber but they are completely out of character.
The Hayden version of Anakin Skywalker is no more the true version than Chris Pine's alternate universe Captain Kirk. Both belong to a false backstory and not the true origin story of said fictional universes.
I reject the prequels as the true origin story of how the empire came to power and how darth vader came to be who he is. I'm still waiting for a version that fits with what we saw in the originals. If no real version is ever made i can imagine my own thats better than georges cartoon cgi and jar jar binks and whiny wooden hayden crap.
I find it helps to note there are only 3 star wars films and 3 indiana jones films, that way my memories are not destroyed.