I attended the SF startup school at the end of 2013 and had a similar experience but perhaps not quite so negative:
1) There's seemingly no access to the speakers outside of listening to what they have to say from a stage. The speakers were really great, and very interesting, but it's a shame I couldn't speak with one or two of them
2) Office hours with PG was incredibly entertaining, but I didn't take much away from it
3) I (perhaps naively) thought I'd be surrounded by people I could learn from so I made a point of talking to as many people as possible. Every single person I took the opportunity to engage with was looking for an idea/funding/technical co-founder blah blah blah. The good news is that I left feeling like our little app http://www.staffsquared.com was doing really rather well given we'd bootstrapped it. The bad news is that I didn't get much in the way of advice or new connections from the day. Perhaps the clue is in the name - startup school, 90% of the people I spoke with had just left college/Uni and were trying to find a pathway in to startups.
I'd definitely recommend the Startup School if you like one or more of the speakers. I left feeling energised and slightly wiser from the talks I listened to. I didn't stick around for the big one, Zuckerburg, because I felt like I'd sat and listened enough for one day...your mileage will definitely vary.