Bottom 10...

[delanvital]

Battlefield Earth: A Saga of the Year 3000 (2000)    (so pretentious)
Manos' the Hands of Fate (1966)    
Deathstalker and the Warriors from Hell (1989)    
Future War (1997)    
The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!? (1964)    
Legion of Fire: Killer Ants! (1998) (TV)    
Robot Monster (1953)    
Santa Claus Conquers the Martians (1964)    (this ones's NOT so bad it is funny)
Shootfighter: Fight to the Death (1992)    
The Space Children (1958)    

And some of the worst sequels ever:
Speed 2: Cruise Control (1997)
American Ninja V (1995)    
Beverly Hills Cop III (1994)

[Dewey]

Star wars 1-3 - sorry but all a big steaming pile of crap with some of the most awful pathetic script writing ever ... here is some evidence m'lud:

ANAKIN: You are so beautiful!

PADME: It's only because I'm so in love . . .

ANAKIN: No, it's because I'm so in love with you.

PADME: So love has blinded you?

ANAKIN: Well, that's not exactly what I meant . . .

PADME: But it's probably true!

They laugh.

---------
Obviously the script writers where replaced with R2 units!

[Ranger]

1] 'Matrix Reloaded' - I take it no one will disagree so I won't give a reason! LOL
2] 'The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!?' (in 3D!) - Ray Dennis Steckler - 1964
3] 'Barb Wire' - starring Pamela Anderson Lee - 1996
4] 'Battlefield Earth' - starring John Travolta - 2000
5] 'Lost in Space' - Stephen Hopkins - 1998
6] 'Showgirls' - even seeing Elizabeth Berkley with her kit off didn't save this! - 1995
7] 'Spice World' - I have two young daughters, I had to sit through this two dozen times until even they figured out it was shite - 1998
8] 'Star Wars' (all of them) - and not just because they ripped off a half dozen other good ideas and just banged them in space craft, but because they kicked started a huge marketing rip-off.
9] 'Titanic' - And not only because of that god awful song! - 1997
10] 'Wild Wild West' - starring Will Smith - When the 'Fresh Prince' became the 'Stinky Prince'