Yeah it was so average it hurt. Waltz, for all of his overacting, might have actually been the only one in the film who actually did something unpredictable while everyone else seemed to be half-asleep. For what it's worth, I think he was good at playing Keane as a showman who grows more and more pathetic and insecure (in that sense, I thought the courtroom scene worked because Waltz didn't hold back at showing Keane at his absolute lowest), but didn't use any of the quieter moments to dig deeper into the character, so we end up with a shallow performance that occasionally hits the intended note.