^ I didn't think that at all. Notice how when the subject of K'mpec's poisoning is first brought up, Gowron immediately goes "What?!?" as if the very idea was horrible to him.
Also: While Gowron was a jackass towards the end, Worf must have felt that Gowron died with some sort of honor, as Worf did the death howl over the body. So I think we can assume that, despite Gowron's actions towards the end of his life, he did redeem himself (somewhat).
Oh, and welcome back, Deranged Nasat