Cyrinishad
Explorer
Well, yes. But this is similar to saying, "You know what? It's so funny that people don't like chocolate ice cream because they don't like chocolate. Strangely, I love chocolate ice cream because I love chocolate!"
It's how preferences work, and all that.
That said, I think there are the following "generic" dividing lines as far as settings go-
1. World v. universe. Some people prefer to talk in terms of a specific campaign world (Oerik- GH, Toril - FR), others in terms of the campaign "universe" or glue (Planescape, Spelljammer).
2. Specific v. generic. Some people prefer campaign worlds that are driven by a specific vision that changes, alters, or subverts typical D&D assumptions (Eberron, Dark Sun, Dragonlance). Others prefer some type of generic campaign world that they can drop their campaign into (FR, GH, Mystara).
3. Then comes the big generic divide- GH and FR (sorry, Mystara!). So I will create a new list of reasons why people tend to sub-group into those two categories.
a. Old school grognards v. people not yet eligible for AARP. There are those who dislike FR because they still remember Ed Greenwood as an annoying contributor to Dragon Magazine, and resent EGG being forced out of TSR. So, it's personal. FR is like a Paladin- smug, obnoxious, and never welcome. And to the younger players, GH is like the old guy complaining about how the new kids need to stop playing the loud music and get off his lawn.
b. Campaign hooks v. completists. The 1983 boxed set for GH (and, to a lesser extent, the Grey Box for FR) was famous for having so many unexplored campaign hooks. Heck- because EGG was forced out of TSR, only one small part of one continent of Oerik was even developed! Greyhawk is a place where you can plop anything, anywhere. FR has stuff, everywhere. And a wiki for it. Which some people love, and some people find annoying.
c. Consistency. Let me analogize this to the Marvel Cinematic Universe. On the one hand, it's great because every piece grow on every other piece, and you can constantly drop bits of fan service in there. On the other hand, it starts to lack internal consistency- when you're telling one story, you begin to ask yourself ... where are the other heroes? Why don't the Avengers (or others super-powerful heroes) show up when New York is being threatened by annihilation by yet another beam to the sky? More importantly, you begin to have a "stakes" issue- if every movie requires an apocalypse, then the apocalypse doesn't seem that important. That's the issue when you tell repeated stories in the same world. It's a feature, and a bug, all rolled into one!
d. Different tones. Greyhawk is very much a product of 1970s hurbermodoing. It's not a "good must overcome evil" campaign. It's more of a Conan/Lieber world, where adventurers are shades of gray, looting tombs, struggling to get by, and there are forces trying to balance the overweening ambitions of both good and evil. FR is more of a Tolkien/Reagan "Good must triumph, eventually, even if it requires a little deus ex machina." Sure, the world is open, but the stories told are those of heroes in a more classical mold. And these heroes are the chess pieces of larger forces (at least, in the published materials).
This is not an exhaustive list, and you can certainly run a GH campaign like a FR campaign, and vice versa. But GH and FR debates are, to borrow the phrase, so vicious because the differences are so small.
Yummm... Chocolate...

I think the ice cream analogy is perfect, because even though I like Chocolate Ice Cream... It's really that I just like Ice Cream, especially when you mix & match the flavors. So, I guess that puts me in the same boat as many other long time D&D fans... No matter how much I like chocolate (and I always will), it would be nice to see some other flavors on the menu.
