I'd have to say that the whole week, from the co-located LinuxCon events, to LinuxCon itself, and LPC, was amazingly well organized and executed overall, probably the best I've seen (or at least on par with LCA).
I hope that what we're seeing here is a case of most people being happy and not having to say anything, with a small minority of people commenting who simply don't understand what it takes to make anything like this work at all, let alone exceptionally well.