...not great.
I gotta say:
A) It looks like crap. It's sketchy and aesthetically offensive. The sword moves and battling animations are terrible, your sword often doesn't even touch the opponent and they always do the same thing when they die. Boring.
B) Plays like crap. You may say it's "skill based action" but it's still essentially hack slash move...over and over and over and over again. Nothing new happens ever. It's just scroll on...hack some more... ewch.
C) "Bob's Revenge" has to be the most boring and generic flash title ever - why is it always "Bob" ? That's terrible man, try something new next time !
I've given 4 stars simply for the music - the music was fantastic and was the only reason I kept playing for so long.