Star Wars Episode III: Revenge of the Sith (SPOILERS)

what i didn't like was first when immediately after mace was killed, anakin bowed down to the darkside.... he didn't feel any regret at all? then he even killed the children RIGHT after that and second was that anakin tried to kill padme and yet he went to the darkside to try to save her...

I'm thinking POSSIBLY the reason Obi Wan was able to defeat Anakin at the end is because Anakin just recently changed over to the dark side and possible his powers were weaker from that? I don't know that is just my guess.

Well, I'm guessing that he may have been able to beat Anakin due to Obi Wan knowing the way he fights? And that Anakin was distracted by rage maybe..

I think it was because he was not yet trained in any of the darkside techniques other than the grip thing that he uses to choke his wife.