For the fight scene with Vader he's pretty cool, I'll give him that. But I dunno... he just seems really boring to be Obi Wan: King of Sass.
I totally understand why having to fight your best friend while the Jedi Order crumbles around you could make someone more reserved and salty, but like Luke in the sequels they kind of just threw him at us instead of using that to tell the story and create new opinions/reactions for him in each situation.