I read a couple of the Republic Commando books, including Order 66, and it gave some background insight to Order 66, which might be expected from the title. Basically, it wasn't just a "KILL ALL JEDI CUZ I SAID SO" order, it was one of those extreme worst-case scenario orders which meant, "The Jedi have turned traitor and are too dangerous to be kept captive." It was also stated that there was a similar order for the chancellor.
As for the OP, I've never experienced Star Wars burnout myself. I've been going strong since I was 10 years old! (I'm 28 now.)