VirgilCaine said:
Um, as far as I know, Greyhawk gives you some details, but the individual DM is free (yea, required) to make up the rest of the details or alter it to suit his tastes.
Yep, and some find that freeing, while I find it not as helpful as something with more detail. (edit: I should also add -- there actually is quite a bit of history and detail available if one wants to look around -- the old TSR scans, the Living Greyhawk book, etc. It's maybe not as handily packaged as FR's detail, but it is there in copious amounts if I did want to hunt it down.)
The downside of more detail, of course, is it's harder to jump in and get going later on down the road. Thus my Dragonlance problem.
(The other DL problem, I just realized, has to do with its timeline/history -- there is a past, a present, and a future -- if I want to set the game in/around the War of the Lance. Same problem with Star Wars universe -- there's not only established past canon, there's established future canon. That's hard for me to game around, for some reason.)
I see DL, FR, and GH basically on the same plane -- all pretty much "standard" D&D worlds. I figure if I know one pretty well, that's all I'll need for standard D&D games. The investment of time/energy to get to know the other two as well as I know the one doesn't, at the moment, seem worth it.