The Square Enix part was definitely the low point of the conference but over all it got me pretty hyped for the PS4.
That's probably due to the core approach they took, I really won't be all that excited if Microsoft comes out and goes into how they want to be the living room box again. As for them opening with games... What al could they even show, exclusive wise? I don't think Gears or even Halo can get me excited anymore. Both of those series have run out of steam.
I'm more likely to build a killer PC to have along side a PS4 then I am to get the next xbox, but we'll see.