In regards to Kenobi vs. Anakin...
It's pretty clear Anakin was not in any way fighting to his full potential. Darth Power has provided enough evidence to accept this as fact, and we can also logically assume this is the case mainly because Anakin by that time was well above Dooku [overall], who in turn was Kenobi's clear superior.
Of course, we can't always use A>B>C logic in the SW universe, but Dooku defeats Kenobi handily each and every time they fight. It's obvious that Kenobi is not nearly on the Count's level, which means Anakin simply wasn't focused and had too much going on in his mind at the time of their fight. A crystal-clear minded Anakin would've defeated his former mentor.
EDIT - Also, the fact that Anakin had previously defeated a good amount of Jedi [including Cin Drallig, the battlemaster], doesn't necessarily indicate he was in the same state of mind as he was in his fight against Kenobi. After all, he was crying because he had murdered the Separatists [and likely because of everything else he had done] and fought Kenobi after thinking his wife betrayed him, choked her and saw him [whom he had considered his brother] take shots at him. Really, if anything, he was even more confused and unstable than he was when he attacked the Jedi Temple.