Negative 1 I have to disagree with you there about Psycho II, it's a classic in it's own right (even Psycho III which is really the sort of Psycho II we could have expected isn't that bad in places).

It builds on the original but has a character all of it's own and has story twists that Hitch himself would have been proud of. Not to mention the sort of genuine pathos that a certain Mr Lucas could have learned a lot from.

It's easy to say something like Blair Witch Project II but to be honest the original was very over rated to start with (yep I prefer The Last Broadcast).

AVP2 is dire but it can't be the worst.

I hate Terminator 2 but it could be saved by cutting all those tedious monologues out and reducing the Arnie humour (I watched the extended version the other night and it has a lot of good bits in it but it but it wrecks a rather nice, all be it silly, story that never needed a sequel anyway). I actually prefer Alien 3 (the extended version) for all it faults it has lots of atmosphere, oh how I wish I could see the Vincent Ward version.

Piranha Part Two: The Spawning is a soft target but it is really awful and the original was fun.

Carrie 2 is more of a bad remake.

Does Carry On Columbus count as a sequel?

Hellraiser III is much worse than any of the greatly loathed sequels that followed it.

Batman & Robin, oh my giddy aunt.

The only film I felt genuinely embarrised to be caught seeing was Caravan Of Courage (if only I had watched the thing drunk) but that's really a prequel I guess.

A Chinese Ghost Story 2 is a big let down after the first one.

Robocop 3 is also dull.

Exorcist 2 is pretty much a given (though I can't stand either take on the prequel though I hope to get around to doing something with them at a later date).

Battle For The Planet Of The Apes is also a sorry mess.