Some of his stuff, like Mysterium, is too... weird for me (I don't know how else to put it). I like pretty much all of his tonal stuff, and the late sonatas are as strange as I'll listen.
I guess I can say that I like the unexpected things he does, but only to an extent. He got too weird toward the end of his life for most people, I think.
Would you believe that I actually used to feel the same way?
It took me a while to adjust myself to the later works... but after a lot of listening to them... it eventually just clicked. Now they're some of my favorites.
But I still adore the early works! He really brought new life into a fading style, which was being replaced by new modernist views...
Then he created his own modernist ideas... and I learned to love them!
But... the first time I heard his "Black Mass" Sonata... I remember being sooo freaked out, thinking it was the worst thing I'd ever listened to...
Now I listen to it all the time!
But... the White Mass sonata took me the longest to grow accustomed to, because at first, I couldn't quite understand it... now I do!