I thought Microsoft had a good showing - good enough to make me consider buying an Xbone by year's end (if you were to go back a few months ago, I woulda said I'd never buy one)
Sony's show convinced me to wait about another 18 months before picking up a PS4. (still interested, just not the right time for me to jump aboard)
Nintendo would have to pull a 2008 to undershoot my expectations - the fact that they are hyping an E3 more than they ever have before says it all. Should be an awesome presentation, live audience or not.