While I have no doubt that this type of crossover stuff is great for building hype (Fanbase 1 + Fanbase 2 + Interested observers), I don't really understand the appeal at all except as a way to try to nostalgia-hook players.
My regular group played Rise of the Runelords almost 10 years ago. We've been playing Pathfinder games on a regular-ish basis since, but I never saw the APs as providing anything more than an adequate experience, or Golarian as anything more than a bland grab-bag setting that exists like a clotheshanger to put their APs on.