I miss many things about LG, but I really love PFS right now. I think the quality of the mods in PFS is OUTSTANDING! If nothing else, how about the maps, missions, and artwork? Yes, some can get very rail-roady, and I often let the players in on some of the backstory so they enjoy the story more.
I would really like to see some more regionalization out of PFS. In the LG days, it was very cool to travel and play mods you didn't already have access to. I also prefer to see some story arcs with recurring characters. We have a little of this in PFS, such as Grandmaster Torch or the Shadow Lodge, but this could be better developed.
Overall, I am very pleased that Paizo is running the show now!