I think had Anakin been introduced as a troubled teen in the first film (or at least closer in age to Padme and Obi-Wan) and had more interaction with Obi-wan in the first film it would have made their friendship a lot more believable as well as creating a kind of friendly sibling rivalry between the two 'brothers'(no not biological brothers) and had Anakin not whined about Obi-Wan for no reason at every drop of the hat in AOTC, I think the climax of ROTC would have been far more intense if Anikan's resentment of Obi-Wan had been left to emerge in the final film.