This is pretty easy..I think these sequels sucked.

5. Star Wars Episode I(We got that in common, although I hated, numbers II, and III as well)
4. X-Men the Last Stand
3. 2 Fast 2 furious
2. Men In Black II
1. Speed 2:Cruise Control

Honerable Mentions

Matrix revelations
Spider-Man 3
Teenage Munant Ninja Turtles III

Any Pink Panther after Peter Sellers passed.

1. Battle Royale 2
2. Infernal Affairs 3
3. Live Free Or Die Hard
4. Carlito's Way: Rise To Power (Technically a prequel)
5. The Matrix Revolutions

1. Any Halloween sequel
2. Any Jason sequel
3. Any Nightmare on Elm Street sequel
Take your pick from any of these other sequels Hostel, Jaws, Omen and there's probably many more I forget.

Honorable mention - movies that should never have been remade from their great originals - The Ring, Quarantine, Let Me In, and the soon to be made Girl with the Dragon Tattoo......

5)ARE WE DONE YET? took away whatever made the first one passable.
4)BRING IT ON 3:ALL OR NOTHING was like a very long CW pilot.
3)VAN WILDER 2:THE RISE OF TAJ and VAN WILDER 3:FRESHMAN YEAR tie as being the only ones here as bad as the first one.
2)GARFIELD 2:A TALE OF TWO KITTIES,because the first one may have been bad but at least it resembled the cartoon.
1)BRING IT ON 5:FIGHT TO THE FINISH was not only twice as different from the first one than the others but also had lame stereotypes.

In no order:
-AVPR
-Halloween 3
- Jason X
-Matrix Revolutions
-Halloween II (rob zombie)

It upsets me the number of people who don't like the Star Wars prequels. I love them... Oh well...
Here are my votes for the worst sequels:

5. Rocky V
4. Freddy's Dead the Final Nightmare
3. X-Men: the Last Stand
2. Batman and Robin
1. Any of the Jaws sequels (Jaws 2, Jaws 3-D, and Jaws the Revenge)

Dishonorable Mentions:

The Godfather Part III
Jurassic Park 3
Home Alone 2: Lost in New York and Home Alone 3
American Pie 2
Ice Age: the Meltdown

1. Aliens vs Predator: Requiem

2. Dracula II: Ascension

3. Speed 2: Cruise Control

4. Nightmare on Elm Street 2&3

5. Jaws 2

Good choices Mitch, only I liked Bad Boys II

There are probably worse ones but I haven't seen them...

5 - Matrix Revolutions - Not a horrible movie overall, just a horrible ending to the the first Matrix.

4 - Halloween series - Remakes of sequels or sequels of remakes? Who cares!

3 - Dumb and Dumberer - The first trailer tried to hide the fact that there was no Jim Carrey or Jeff Daniels in this crappy sequel! And Hollywood appeals to our morality for pirating movies? Irony!

2 - All the Batman sequels - I know everyone thinks Schumacher destroyed the series, but as a kid I just shook my head when I saw Tim Burton's Penguin launch an attack on Gotham using an army of missile armed penguins! WTF? Let's hope Chris Nolan can finish off his trilogy with a bang to make up for those older Batmans...

1 - The Prequel Trilogy - Don't get me started. We forgave Lucas for being a sell out with those Ewoks because the first trilogy was so awesome. But this nonsensical video game crap? Jar Jar the fake looking cartoon character - that even little kids think is stupid - pretty much embodies what this whole trilogy stands for: Lucas mailing it in and collecting his billions. The only thing that Lucas seemed to remember about the old trilogy was the product licensing royalties.

1. Troll 2
2. Highlander 2
3. Halloween 3
4. Batman & Robin
5. Speed 2

5. Speed 2
4. Quantum of Solace
3. Batman and Robin
2. Matrix 3
1. All the straight to DVD American Pie series.

Star Wars: Episode II – Attack of the Clones (2002)

Saw IV (2007)

Rocky V (1990)

The Exorcist II: The Heretic (1977)

Jason X (2002)

5.Aladddin II

4. All the new Star Wars

3. Save the last Dance 2

2. Butterfly Effect 2 and 3

1. Speed 2 Cruise Control

1. big top peewee
2. Teen wolf 2
3. Doesnt matter cant be worse than those two

I'll list just one for effect:

Godfather III