I just looked at the list, and realized how many didn't make the cut that I'd disagree with.
2001: A Space Odyssey, by Arthur C. Clarke
Beggars In Spain, by Nancy Kress
Armor, by John Steakley
The Conan The Barbarian Series, by R.E. Howard
The Demolished Man, by Alfred Bester
The Incarnations Of Immortality Series, by Piers Anthony (oft mentioned for good reason)
On Basilisk Station, by David Weber
The Stainless Steel Rat Books, by Harry Harrison
When Gravity Fails, by George Alec Effinger
Some are mentioned, but also how about these not on the list:
The Sten series by Chris Bunch and Alan Cole
The Sword Series OR the Berserker Series by Fred Saberhagen
Bio of a Space Tyrant by Piers Anthony
"The Man Who Never Missed" by Steve Perry
The Hobbit. I mean The FRIGGEN HOBBIT was left off the list? Or is that included in LOTR... then I'll be less outraged.
"Case of the Toxic Spelldump" by Harry Turtledove who should REALLY be on the list for his "Alternate History" series.
The more I look at the list, the more disappointed I am. At least the AFI when they did their 100 best movies, did a pretty damn good job in comparison.