I have to agree with you there, except for the first of the series The Divine Invasion which I enjoyed quite a bit. Was hoping the other two would be similar, but they each got increasingly weird.
I thought that Minority Report and Paycheck were pretty good adaptions of the short stories. Except, in Paycheck, they changed the ending quite a bit. However, most of the story was there.
It is the same thing with "Stir of Echoes" by Matheson. I love the author but I couldn't watch the movie before I read the book.
"I am Legend" by Matheson has not been made into a movie but it is the base for so many Hollywood horror flicks that it is laughable. This story is so damned good. It is true literature to me. The protaginst Robert descends into despair wallowing in Alcoholism because of impossible goals. It is a heroes saga with a tragic ending.
Mr. Dick's Valis trilogy was interesting to me in one way. I got to read a great writers description of what schizophrenia is like. After the second half of the second book, I started to grow horrified. The third book was a chaotic jumble.
I am deep in my cups (Read: Drunk.) but reading the Timothy book probably scarred my mind, LOL!
One book I like which is about gods and such is Roger Zelazny's "Lord Of Light". People say it is too complex but I don't think it is.
Since I am babbling on about all things SF, let me throw out one of my favorites. This would be "The Mote In God's Eye". F'ing classic.
Arioch7