Only read Neuromancer, and didn't like it as a 11 y/o. It's better with age, but not zomgelventyone awesome. Cool genre though.
Neal Stephenson is a great author, but his longer works take some effort to get through. Zodiac was great, even if it was about a duck squeezer. :)
Never read much Niven that I recall.Tried to read Lucifer's Hammer a couple times, but I couldn't make it past the first few chapters.
Gibson got better after Neuromancer, IMO. I enjoyed
Count Zero and
Mona Lisa Overdrive.
Pattern Recognition was interesting, though less SF.
The Difference Engine, Gibson's collaboration with Bruce Sterling, was quite good with a unique plot, though I thought it a bit dry.
I agree on Stephenson. He puts an awful lot of detail into some of his books - and I had a hard time following
Cryptonomicon.
Snow Crash was a blast, though, and
The Diamond Age was a great read.
I find Niven's short stories to be more agreeable than his full-length books. I bought
Playgrounds of the Mind, which is a collection of short stories, excerpts from books, and Niven's own comments, and thoroughly enjoyed it.