I enjoyed Enders Game(Orson Scott Card) but the follow ups were weak for me, whereas I wasn't enamoured of Dune but enjoyed some of the subsequent books more. L Ron Hubbard, I read Battlefield Earth, it's ok a little simplistic but some fun ideas. Tried his Mission Earth series, think it's about 10 books, but never made it past about No 4, and it was sheer perseverance to get that far. I was also a lot younger then and yet they stil lseemed immature.
I've got most of Ian Banks, without the M, books as well, more hit and miss than his SciFi for me. Sometimes it can seem similar to reading Martin Amis. Liked the Wasp Factory, Walking on Glass and Espedair Street, not so enamoured of Canal Dreams, and Whit I thought was quite poor. On the SciFi side Excession, Use of Weapons and Look to Windward are up there for me. Like most of the others except Against a Dark Background, apart from the Solipsism humour, that one left me cold.
What first started me on SciFi? very hard to pin down, I probably drifted in via fantasy. Some of my earliest books were The Hobbit, The Weirdstone of Brisingham and The Moon of Gomrath by Alan Garner. The Dark is Rising series by Susan Cooper, Lord of the Rings, the Narnia books. Earliest SciFi would have been Asimov, ACC and the big bumper books of short stories. I've gone through phases of authors, find a book I like and then buy/borrow everything they've done. Over the years I've moved further away from fantasy and my tastes have trended towards harder science. Can be a bit heavy going sometimes so the odd light read is welcome.
I think if you like reading you'll read almost anything. I've read the kids books, including the inevitable Harry Potters, Janes collection of Wilkie Collins. All sorts of pulp thriller, detective stuff, horror, potboilers. The only ones I've almost never read are biographies, just never appealed. We had a clear out last year and I think over 300 books went to the charity shop. Though I've now been looking at e-books and the storage/viewing mediums. Some of them look pretty good now and the idea of being able to carry around a huge library is very attractive. Apart from anything else it would save a huge amount of space at home.