In TPM, he is a good kid, and even though Jake Lloyd was pretty bad, it put away all preconceived notions that Vader was a bad kid from the start, and he was actually alot like Luke in ANH.
TPM Anakin = Mission Accomplished.
In AOTC, he is a whiny, and should have been more likeable, and he can't talk to girls, but he is a teenager so I will let it slide. He finds his mother and she dies in front of him, so he goes apeshit on a bunch of tuskens in revenge, and though he did go overboard, revenge is a powerful thing when faced with a loss of a loved one.
AOTC Anakin = I am still on board
In ROTS, he kills a bunch of Jedi kids as his FIRST act as Palpatines pupil, even after he says, "What have I done?" He then goes on to choke his wife, and has to take some credit in her death, even though that is not the reason she died because technically lost the will to live.
ROTS Anakin = You lost me
When I see Anakin as a force ghost in ROTJ now, whether it be Shaw or Hayden, and I think about it in the context 1-6, I don't think he should be there for what he did. I understand he redeemed himself by saving his son and killing the sith, and his last scene should have been with Luke as he dies with his mask off. By never seeing Anakin after that it says this moral message after 6 movies, "Good people do bad things, good people can do awful things too, and in the end, even if you do good at the end of your life, it still doesn't erase the horrors you put on people for many years." By Anakin not being a force ghost, and only Kenobi & Yoda staring back at Luke, it says that Anakin was able to see his son as the good man he was, but he will pay a price for his horrors as he can never become a force ghost.