I felt the same way when they did it again with Palpatine in Episode III.
That one hurt me more than Yoda. Yoda I kind of get; he was a different person in the prequels, not so disillusioned from losing a war and living in hiding for thirty years. But Palpatine? That utterly missed the point of the character. He's a
manipulator, the kind of guy who gets other people to do his dirty work for him. That was his MO in Episodes I, II, V, and IV. He wouldn't deign to touch a lightsaber, let alone own one, because he'd already have some flunky lined up to die on his behalf.
Man I hated Episode III.