While I could nitpick Pogo's placement of some specific films, I certainly wouldn't use that to disparage his credentials as a "true fan of the genre."
People have different opinions... no big deal.
Here's a few big changes I personally would have on my top 100 list (full disclosure: this is off the top of my head, with very little thought given - perhaps someday I'll take the time to really put together my top 100
Ones that would not make my list:
Men In Black
Gattaca
AI
Paul
Earth Girls Are Easy
Cube
Spaceballs
Sunshine
Truman Show
Mars Attacks
Ones that Pogo missed (in no particular order):
Carpenter's The Thing (although, nowhere near as high as #2 or 3... it would probably be around #25 or so on my list, I would guess)
A Clockwork Orange (I suppose it's debatable if this counts as scifi, but I consider it such)
Dr. Strangelove (same as above)
Dark City (Sleeeeep!
)
Donnie Darko
City of Lost Children
War of the Worlds (1953)
Robocop (1987)
Equilibrium
Cloud Atlas (I know I'm in the minority on that one, but I thought it was an amazing film)
Ghostbusters
Being John Malkovich
Timecrimes
Man Facing Southeast (little known film from Argentina - this is the film that inspired K-Pax, which sucked... see Man Facing Southeast, instead - it was awesome!)
aaaaaaand... Logan's Run (I know, I know, it's flawed... but it's one of my guilty pleasures