Actually, despite works such as the Guggenheim Museum, FLW as a Post-Modernist in an age of Le Corbusier, Walter Gropius, and Mies van der Rohe. Sure, ego probably played into it, but most accomplished architects are rather egomaniacal, as you have to be to make a mark on the land that will be there many generations after you are dead and gone.
The thing I like most about Mr. Wright, though, is that the longevity of his career and the generosity of his patrons allowed him to produce a collection of works that go accross the design spectrum. Fallingwater to Guggenheim, Dobie House to his never-built Mile-High Skyscraper, the dude produced some neat stuff!!
FReegards...MUD