This executive video summary of the announcement is brutally onesided, but it does kind of drive home why it was a bad, bad presentation:
https://www.youtube.com/watch?v=0rJDn0jRnUQ
What did we actually get? Specs (which look good, and it's a PC which is even better), the controller, that a lot of huge new cross-platform games would be on PS4 (which everyone knew already), some very interesting networking promises but only the video upload demonstrated (we think).
There were no incredible exclusives shown. The 3D vectorman thing (Knack) looked pretty cool, but it's not a system seller, and neither is yet another Killzone or a team-only racing game. The best stuff (Watchdogs, Capcom) was cross platform. I'm sure they have heavy hitters coming (Santa Monica, Naughty Dog), and whatever the hell Media Molecule is doing will have to be great, but what was shown at the event was pretty vapid. Square-Enix showed off a year old demo.
We got no price, we didn't see the hardware (because it was just all running off dev PCs). We got 'no back compat, except maybe in the future', we got nothing about whether used games would be allowed, we got something about real names being required, and we got SO MUCH footage of developers gushing about how happy they are that it's a PC in a box (instead of a nightmare like the PS3) and throwing around the usual 'synergy' 'unleash' 'creativity' 'the socials', and of course we're told, exactly like we were told for PS2 and PS3, that the hardware is now at the point where it is 'emotional'.
Oh yes, we did get a promise for some Final Fantasy news at E3! Woohoo?
It was definitely a stock drop event.