Dingdingding! I think a lot of people really underestimate just how much influence Palpatine had on Anakin. He spent years subtly grooming Anakin into precisely what he wanted him to be. If he hadn't been there whispering in Anakin's ear and subtly inflating his ego and undermining his Jedi teachings at every turn, Anakin may have turned into a very different Jedi. Still not "perfect" but it seems clear that a lot of his arrogance has been carefully cultivated by the guy telling him "You're going to be the bestest Jedi ever!" every time they talk. Not to mention the mistrust cultivated by all the "The Council doesn't trust you/is afraid of you" talk. We only get a few moments of that in the films, but the insinuation is that Palpatine's been doing that very same thing for the better part of a decade. Given that Palpatine was the most important person besides Padme and possibly Obi-Wan to Anakin, I don't think his contributions to the person Anakin became should be understated. He preyed upon Anakin's flaws and in so doing inflamed them to "critical mass." Given Anakin's desperate desire for acceptance, if he didn't have someone who's "teachings" were running contradictory to everything Obi-Wan and the Order were telling him, he might have accepted his place among the Jedi much more wholeheartedly.