The book wasn't as horrible as some of the required reading in high school English classes . . . in fact, it wasn't nearly as bad as L. Ron Hubbard's Invasion Earth series of books. (Can't speak for the whole series, as I didn't even get halfway through the first volume before flinging that tripe across the room.)
Yea, that was pretty much a massive advertisement for the Church of Scientology.
I read that WHOLE damned series, thinking "C'mon, it's got to get better.... " when I was 15....
Needless to say, it didn't get better.
B:E the novel wasn't the worst thing I ever read, but damned nearly.
The whole "secret base in the clouds" bit just really slew suspension of disbelief for me, not to mention tribals figuring out advanced weaponry in a few months time.
The movie wasn't as bad as Zardoz.
Hell, Zardoz had the advantage of being taken as a comedy, in a way. It even got a recap on agonybooth.com