UPDATE: Thanks for keeping this going in the comments. I don't have much to say about the visuals. The House fixtures looked surprisingly shabby on HDtv. Obama spoke slowly, had some gray hair, and made stabbing gestures with the pinched-together fingers of his left had. The mixing of the Democrats and Republicans in the audience really did — as critics warned — have the effect of making it look as though everyone supported him, but perhaps the demonstrations of support were a bit more toned down than they would have been if the parties had kept separated.
UPDATE 2: Instapundit has a grim screen capture. Was O's suit that blue?!
AND: As for that look, I think that's the Boris Karloff look.
CONFESSION: I slept through parts of it.