Yeah I don't know how calling a piece of music "delusional" validates as sound criticism, but yeah I see that a lot too. But rest assured, I was only commenting about the man, not the music! The music is mighty fine though.
It's also quite an interesting thing you said about his sonata cycle demonstrating the development of his musical language. I think that the preludes, and not just the op. 11 set, all 70+ preludes pretty much gives you the same demonstration. Although on a lesser scale, you can see that Scriabin used the prelude form for musical experimentation (much like Chopin did with his mazurkas.) They also stretch out from his early period (op.2) to the very end (op. 74). I'd love to go an "complete Scriabin preludes" program, it sounds like an awesome experience! The "complete sonatas" too...