I liked Flash Gordon, a much treasured cult classic with great turns from Bryan Blessed, Max Von Sydrow, and Timothy Dalton, and while Voyager clearly wasn't as good as TOS, TNG, DS9 in most respects, it still had it's moments and I'm enjoying S4 more than I expected on Virgin 1.
Godzilla (98) - A turgid borefest that was a step down from Independence Day and that's fucking saying something. And how can a 200 ft tall dinosaur vanish on a island with a population of 6 million and crawling with half the US Military?
At World's End - Primarily a meandering snorefest on the high seas that, with an exception of a few good action scenes, nearly throws away all the goodwill generated by The Curse of the Black Pearl and Dead Man's Chest.
Andromeda - I found it complete cheese from the minute go, I bailed long before Kevin Sorbo allegedly took the reigns of the show and turned it from mediocre to awful.
The Mummy Returns - Sugar coated, syrapy gash.
Bonekickers - You can whinge on and on and on about Doctor Who being a clagfest, but boy even the first season of Torchwood cannot approach the hypnotic, blood curdling badness of Bonekickers. The worst program the BBC comissioned in the last ten years and deservedly sank without a trace as well.
Stargate: Atlantis - The very definition of 'meh'.
Smallville - Why the fuck is this still going on?!
The Lost World - Badly directed and thouroughly mediocre.
Jurassic Park III - Ouch.
Mortal Kombat - One reason why video game films are widely seen as very bad.
Street Fighter - Another one.
Mortal Kombat II - And another.
Thunder in Paradise - Does anybody remember a early 90s TV show starring Hulk Hogan in a hightech speedboat with stealth capabilities and AI? If you say 'no' then you're lucky buggers.
..but what films get your vote for the absolute worst science fiction movie ever? the film you choose has to have a great reason as to why you pick it over anything else! Of course, many absolutely terrible films can often warrant a viewing in their own right, usually out of sheer curiosity or with the high novelty/comedy factor! 
