Exandria is my favourite campaign setting, by far, and a worthy successor to Greyhawk, while also incorporating most of the classic tropes of other D&D settings, particularly the Forgotten Realms.
It's essentially an 21st century version of the classic high fantasy setting. Much like Greyhawk, you have your basically Tolkenesque elements (i.e. the Dwarf city state of Kraghammer, the Elf city state of Syngorn) and your primarily human kingdoms that are loosely modeled on IRL cultures. However, these are much less homogenous now, so that even Kraghammer, Syngorn, etc. do include plenty of other species, even if there is sometimes tension.
You've also got links to traditional D&D settings like the Underdark, the Feywild, etc. And a pantheon plus historical events that riff on D&D staples. So the overall effect is kind of like pastiche D&D setting, updated for contemporary play.
They also have fantastic sourcebooks. Explorer's Guide to Wildemount is, IMO, easily WotC's best designed setting.
I'm not sure what is meant by the comment about "lack of meaningful conflict," above. There is plenty of conflict in Exandria: dynastic conflict between powerful nations such as the Dwendalian Empire and Krynn Dynasty, conflict against powerful entities such as the Chroma Conclave and Vecna, and all kinds of other options for antagonists (Illithids in the Underdark, transnational criminal organizations, and so on).
Also, I've run dozens of campaigns set in Exandria, and have had no problem making it feel like my own. The sourcebooks do a good job of getting you started but leave plenty of scope for you to do your thing. For me, it's the current gold standard.