Lyxen
Great Old One
I mean, FR has a bunch of popular novels under its belt, contains pretty much all the recognizable NPCs not named after original players or creators and has basically been the only setting WotC puts appreciable support behind for almost 20 years. And, while I hate its DC-comics like tendency to explode itself every few years, a lot of people appreciate the sense of progression that few of the other setting have.
Well, YMMV, but the novels are all pretty much crap from a literary perspective, the setting is progressing mostly through stealing ideas and integrating the cool things from other (better ?) settings and as a result is a huge mish-mash lacking any real soul, and a lot of people complain about the forced progression through various editions to explain the changes of the world through catastrophic events that destroy their beloved lore.
