Originally posted by S_W_LeGenD
Grevious was perhaps not as coward as some would think but he would run off from battles whenever he was on the verge of defeat.Also, he might have killed some normal Jedi but when he fought against an experienced Jedi Master like Kenobi, he lost badly!
And he was not as powerful as you consider him to be and he was not even very smart as well because he could have tried to escape from Kenobi but his over-confidence and mis-judgement got him killed during his fight with Kenobi.
Obi-Wan even referred to him as "very un-civilized"!
I do agree with you.