I had fun watching the 3 days... they went too quickly. Think IBM's Watson is an amazing achievement (to be able to interpret the ambiguous questions, nevermind respond so quickly, etc), and quite entertaining to watch.
Was pleased the 2 other players appeared light hearted at the end of last night's show after being crushed by Watson, with Ken's comment "I for one welcome our new computer overlords" and them mocking the avatar.