Batman Forever.I could watch Batman and Robin through with a dull brain and say it's not that bad but forever was so fucking bad I couldn't watch it with a dull brain and I just wanna remove it from being made.
Con Air is one of the biggest festering pieces of shit ever made. Nicholas Cage's acting is so horribly atrocious, you just have to laugh every time he says anything. All Michael Bay movies follow in quick second. And third, there's Birdemic. Unwatchable. Unless you're making a drinking game out of it.
Possibly the worst movie I've ever seen in my entire life, so bad that it's beyond any hope of being so bad that it's good, is Borderline Cult. My nephew is like an otaku for horror films, and as a result I see a lot of them whenever he's around. The plot makes no sense, the cinematography is awful, there is literally no character development, none of the kill scenes are even slightly interesting, and the production value of the movie has to come in at somewhere around $50. Like seriously, in the commentary for the film (we watched part of it to understand how on earth such an abomination could be released to the public and have hopes of turning a profit) the director reveals that principal photography took place over a period of two days. In other words, all of the filming for an hour and some-odd minute movie was done on the weekend. The only locations used in the film are 1. a small Californian town made to look like Juarez by virtue of nothing but an onscreen notification, and 2. some old lady's house. The director was friends with some old lady, and just asked her if they could shoot their movie at her place. You know you've got a blockbuster when you're hitting up old bitches for keys to their shack in the desert. And you know, this would all be somewhat forgivable if it was produced by the director or some indie group. But no. Lionsgate gave the green light on this festering pile of crap. I've tried running the scenario through my head that would allow anyone to ever consider this movie as fit for release, but it's honestly not there. But a major company like Lionsgate? Seriously? Oh, and go check out the IMDB page and look at the reviews for it. They're quite hilarious.
Remember these are movies you hate the most, not ones you think are the worst. In that vein, I'm going to say the prequel movies in the Star Wars series. They were uninteresting, took themselves way too seriously and were just lifeless and bland compared to the original trilogy.
Now that you mention the Star Wars prequels, I had to think of this: Seriously, if you have an hour of free time, you should watch all these parts. The funniest, most insightful, most viscous review of the first one.
Star Trek V: The Final Frontier and Robocop 2. (Somehow I like Robocop 3.) For being just fucking atrocious.
I Liked episode 2 and 3... Well, the beginning of episode 3, the battle of coruscant was fucking amazing.
How can you guys hate Episode 2?! Oh wait... this was the only good scene: I like this scene from Episode 3: Its so beautiful... "When her death came, I hope it was quick... she'd earned that much."
Episode 3 wasn't too bad, IMO. But 1 left me completely bored and 2 was in desperate need of a finer touch.