I've only dabbled a little in Warcraft, was the entire thing designed by a single individual? I'm guessing not.
I can respect that there are certainly many differences that make the comparison moot for the most part. And I'm a fan of Tolkein. But Warcraft is far and away the richer IP, and Chris Metzen, who greenlights the lore, deserves most of the credit for the world they've developed.
Looking at what Tolkein created, however, I think you do have a point in many regards. At the same time, the world building in A Song of Ice and Fire is often just as deep in its own somewhat different way. Tolkein's worldbuilding goes back eras, but Martin has reams of secondary characters on a scale that's almost unheard of in literature. It's likely that both of these will go unrepeated, in some ways, but I think Martin shows that there's still room for the genre to grow in depth in ways that we have yet to see.