In recent memory, I would say Super Mario Bros. It was god-awful, but that made it hilarious.

In terms of fiction, the fighting temptations. Ugh. So boring. So much gospel.

But, for overall it's No Intelligence Allowed, an incredibly dishonest pseudodocumentary on Intelligent Design with Ben Stein.

The Last Airbender

M. KNight jibberjaberwhateverhisnameis needs to die.

I have fond memories of this one. Now I know what's it called. Seems it's on the Bottom top 100 on imdb as well.

Scarface - Tried watching it just to see the "say hello to my little friend" part but after 2 hours of him being in a hot tub I turned it off.

Mad Max - I've tried watching it twice, both times I got bored/pissed and turned it off.

The Master of Disguise - Need I explain?

Difficult to pick an outright winner..The last Indiana Jones film (Crystal skull) was a pile of shit.
1 missed call- Terrible
Tomb Raider 2- embarrasing, especially when Lara punches a shark in the face.
Highlander 2 -oh no, the first one is a classic,this is complete nonsense.
Kill Bill- contraversial i know, but this film just didnt do it for me

There was a sequel?

Going to have to go with Alien Resurrection.

Meet the Spartans by far.

I'd like to add Charlie's Angels: Full Throttle to the list. Goddam that movie.