FR is awesome. Best D7D setting. PERIOD.
Hey, look guys, let's play Dark Sun. Hey look guys, more sand in your vaginas and buttholes! DEEP.
Planescape? An excuse to explain the outerplanes connecting to everywhere. Goodf or what it does but not really a setting but a cool place for high level characters to explore when smacking orcs and goblins are passe.
Greyhawk? A wanneb FR. And, yeah, I know it came first. But, yawn.
Birthright? Woopity do dah. You get to be royalty. OMG. You can do it everywhere.
Dragonlance? With their fake paladins their stupid wizard rules (lol let us copy FF1 magic classes
). Forget the idiotic gods. Books were decent but playing in them was all about changing its rules because they were anti anything that would change the books.
Ravenloft? Nice for a visit to say hi to your friendly neighbor vampire but an actual full fledge campaign setting? COME ON. It's called a DEMIPLANE for a reason.
Oh. There's that inner world or whatever it was called? That was a nice little concept but no depth.
Now, the Realms has issues too but the fact you can play it any way you want is awesome. You want DS? Go play in Anaurach? DL? There be dragons and silly gods in the Realms too. RL? Vampires exist and you can always have your players go there. Same with PS.
FR > ALL
But, the best? FARLEXIA. That was the best.