One thing that's been bothering me lately is that the more I think about these Jedi characters of the prequels, including these early versions of Obi-Wan Kenobi, the more I realize how unwizardly they seem to me.
Alec Guiness played Ben Kenobi with a little twinkle, something extra that gave him a wizard-like feeling, maybe it helped that Luke saw him that way, but even before Luke interacts with Ben the old guy is definitely coming off as a wizard (and now I am officially sick of the word "wizard" ) scaring off the Tuskens and having that great reveal and being friendly towards R2 while looking over Luke's unconcious body. Throughout the rest of his performance in the film, the guy seems to have that something extra, that "twinkle", which lends credence to the idea that he's wielding space magic and comes from an order of others wielding that space magic. That Merlinesque sense of wonder that surrounds Ben make him special in a cinematic universe that's already incredible to begin with, it's one of the things that has drawn me to the Star Wars universe even from an early age. Yoda also had that "twinkle" in the prequels, his wisdom wasn't just given out like a grade school teacher, over and over he made Luke - and by extension in a way, the audience - earn the right to gain the knowledge of the Jedi Knight.
In the prequels however, it seems like the idea of the order of wizards did not fully come to pass. In TPM we're given Qui-Gon who is a tiny bit wizardly at times, but I never felt he totally carried it as it came and went too inconsistantly; and the Jedi Council was portrayed more like the Los Angeles Unified School District Council with all of the magic and sparkle of a meeting to determine whether or not to raise the price of student lunches. AOTC had a fully-knighted Obi-Wan yet he was merely a chiding mentor without any real magic whatsoever (except possibly the "good job" line), and every other Jedi was portrayed as a galactic FBI agent except for Yoda who was a kindergarten teacher.
Never did I feel that the Jedi of the prequels were magical wizards wielding arcane ancient knowledge in the service of protecting the order and peace of the galaxy, the Jedi of the prequels were just guys with Force powers, brown robes, and lots of flashy lightsaber moves for the most part.