If Anakin started to mess with Dark Side things and they told him he had to stop, he says that it is not that bad and he thinks everyone should try it and so they kick him out and ruin his life. And throw a suspicious husband aspect on top of that (Obi-wan and Anakin's yet to be named Wife?) and maybe we now have a candidate for "feeling betrayed by the Jedi."
I don't know, what do you think?
Xhonzi
Related: I thought Vader would personally go around and kill all the Jedi personally. Not some order 66 (anyone read that Twisted Toyfare Theater? It had me rolling!). As I was thinking about this, I thought it might make sense if Vader thinks some of the Jedi really would like to build this Sith Kingdom on Earth (so to speak) and so he went around to all the Jedi inviting them to join.. and they try to kill him Sith Lord that he is, so he kills them right back! And then pretty soon, he stops asking them to join, he just jumps to the end where he kills them. This, of course, would take place between 3-4 since we never see Vader in 3. Maybe some comics or something.