My feedback in short: The modules I played/run were really really busy. Loved the prep around things, getting players to my table/getting to a table were both awesome, but I went up to/over the line in every module I played/run. I ran 5 and played 4.
I played the Thursday and Friday specials: and I found them extremely rough. I played Thursday night with a bunch of casual gamers, figuring that slowing the module down a little compared to past games might make it more enjoyable: nope. GMs had to prep a TON of encounters and even those that were prepared (like our GM) were really having a hard time keeping up with things that were going on. We weren't particularly slow, but I felt like we were constantly racing, and never got time to look around and figure anything out.
I'm a lore/exploratory guy, and there was literally nothing for me to do, it seemed. No exposition, no talking, just ran from encounter to encounter.
Same problem, except I played with friends, and a GM I'm friends with. Same sort of problems, except we raced through things because of how badass our gunslinger was, and we still didn't get through anything.
Both specials seemed really really busy. That being said, the plots that they did have were quite creative, I just felt it was too much.
We couldn't hear a thing in the corners of the room during the specials either. Luckily we could read things, but it was hard during the announcements to catch anything.
As a GM:
I enjoyed everything I ran, people got to my tables fast, and I had a lot of great players, even when I really was not at my best (I'm looking at you, Saturday afternoon 6-22). 6-22 has a lot going on, I went right up to 4 hours 45 minutes both times with it, but we got through it.
The pregen specials were fantastic. I had mostly engaging and enthustiastic tables, and the plots had plenty of pop which allowed people to get into them easily. Most players loved them (I think I had one who didn't Sunday morning).
In short: the con staff was fantastic. This was my first year at Gen Con as a GM, and I loved it. I will do it again next year as I had a great time (maybe I'll spread out my games though, running three in a day is HARD)!