There was a sequel to The Sting that had none of the original cast, but different people reprising the key roles (see http://us.imdb.com/title/tt0086370/ – Jackie Gleason and Mac Davis in place of Paul Newman & Robert Redford?)
But I adored Grease2! 
*Highlander 2: the Reckoning * (Makes no damned sense at all)
Ginger Snaps 2 and 3.
The Critters sequels
All of the *Leprechaun * sequels, including *Leprechaun: Back 2 Tha Hood * (is there a word for what happens when one becomes a parody of oneself?)
Once Upon a Time In Mexico (sequel to Desperado, third in the *El Mariachi * series. That said, it was sort of amusing to see Johnny Depp’s third arm)
And, as I am paying by the minute for this, I shall end here.
bamf
Beyond the Poseidon Adventure
Am I really the first to mention *Ghostbusters II * ?
Saturday Night Fever was enjoyable, even though after several viewings I still only vaguely understand the plot. I refuse to see its sequel, Stayin Alive, simply because I object to the disappearance of Travolta’s chest hair on the box art.
I’d like to nominate Friday The 13th: Part V. The ending definitely lent itself to a sequel, and it could have been good, but Part VI completely ignored the premise and brought back Jason as the Frankenstein monster. Not that I don’t like Jason, but that just wasn’t where the last chapter left off at all.
The Nightmare on Elm Street sequels. Although Wes Craven’s New Nightmare was pretty good, I’ve always seen it as apart from the regular series.
No
I enjoyed VI. While it was no II, Wrath o’ Khan, I thought it was good because it put Kirk squarely where he belongs - fighting Klingons. The first Next Generation movie was terrible but the second was ok because it let Pickard do his thing - fighting Borg. Basically the maxim - odd numbered Trek movies suck - seems to hold true:
I nominate Starwars and its sequels/prequels - though IMHO the first movie shouldn’t have been made either.
I’ve never been able to stay awake through any Star Wars movie - about 15 minutes is all I can manage before I’m fast asleep.
I also think Alien should have quit after the first sequel - the other 2 were pretty lousy in comparison.
I humbly nominate Aladdin. I very much enjoyed the first one but I can’t say the same thing for numbers 2 and 3.
I’m also not so sure that Bring it On needed a sequel.
I know it hasn’t been released or even filmed but I’m very nervous about the Pirates of the Carribean sequels.
Just to be contrary…
I liked Grease 2’s story and plot much better than Grease’s, mainly because I found the characters more sympathetic (and Olivia Newton John going from sweet to “cool chick” in the first movie was an example of taking sexy and making it totally unappealing). The songs in the first were much better though.
As far as Disney’s Aladdin goes, the first I have on my top five greatest movies of all time list. The second was eh… better than a lot of Disney movies though. The third, though, was really good for a direct to video sequel to a direct to video sequel.
Did The Jerk Too nned to be made?
We really didn’t need any of the sequels to Planet of the Apes.
I heartily second The Sting. Even though David Ward wrote the sequel, it has bad written all over it. At no time does it feel as if it’s actually taking place in the 1930s. Mac Davis? Teri Garr?
The original King Kong should have had a sequel, but giving them only a fraction of the amount they needed and expecting a good flick was obscene. On the other hand, the 1976 King Kong shouldn’t have existed in the first place, and there’s no way it should have gotten a well-funded sequel like King Kong Lives!. The universe is not fair.
Neither version of The Fly should have had a sequel, especially as grossly underfunded a one as Son of the Fly.
I actually liked Return of the Living Dead, but there was no justification for one, let alone two sequels (aside from giving us two of the dumbest movie titles ever – “Return of the Living Dead, Parts 2 and 3”?)
The Hidden was an excellent science fiction film (even if it did rip off Hal Clement’s “Needle” without a thank you), but there’s no reason it should have had a sequel. Again, it had two.
Was there really a good reason to make two sequels to In the Heat of the Night?
I’m going with Rocky. The original was a great piece of filmmaking, characters you can care about, a nice story and a classic finish. All the sequels did was turn the character into a caricature.
I disagree on this one. I’ve never seen the sequel to the original/ But the sequel to the Goldblum remake wasn’t that bad. For most of the film, they even use proper security precautions.
War of the Roses.
A few years ago, the Internet Movie Database actually had an entry for a not-yet-released movie called War of the Roses II: The Children. I shit you not. Thank the Great Arkleseizure it never got made.
Heh. I enjoyed them all, but they should have been called:
The Matrix 2: Treading Water
The Matrix 3: We’re making it up as we go along, honestly.
EEEEEEK! “Aliens” (the 2nd one) was the best of the four, and the only one I really didnt like was #3 (although #4 wasnt brilliant, it was alot better than 3).
Agree with the Star Wars prequels… utter crap really, but you can`t go against most of the human race and say the first three were junk. George Lucas should stick to writing story outlines though, and then letting some real writers flesh out the dialogue and scenes and get a decent director.
Jaws sequels got steadily worse… oh dear.
Rocky sequels weren`t too bad I think, until Rocky V (dire).
Pirahna: The Flying Killers was a better movie than it`s spawn… Pirahna.
From Dusk Till Dawn 2 wasn`t too bad, but nowhere near as good as the first one.
House was great… House 2 etc went downhill.
The Evil Dead series got better and better, maybe because they morphed along the way from scary scary horror, to scary funny horror to funny funny horror`.
The Dirty Dozen should have stayed as the one movie.
Home Alone, ditto.
Toy Story 2 was as good (if not better) than 1.
anyone remember if Gremlins 2 was any good?
Harry Potter was the biggest boring stupid piece of shite Ive ever seen, so Im shocked that a) people liked it and b) they`re making more of the tripe.
Porky`s 2 was as good as 1.
Come on, you can’t be that shocked. A) happened because it’s an extremely popular book series, and B) happened because (as a result of A) the movies have all made loads of money. The third one was the only one that’s actually been a decent movie.