The Pirate Movie - One of the funniest parodies ever.
Transformers: The Movie - Robots! Transform! Optimus Prime, however, bites the dust. Very sad. 
I liked both of these movies as well.
Casino Royale made no sense but had a quirky weirdness I liked…and you get Woody Allen as a Neurotic, Inept super-villian. Quite funny as well.
Incubus was wierd…but interesting enough.
I’ll second (or third) Unbreakable. If it had ended 15 seconds sooner, then it would have been great.
I’m NOT surprised no one has mentioned Street Fighter. How can someone NOT like a movie starring Van Damme as video-game character Guile, Ming-Na Wen as Chun Li, and the late, great Raul Julia - in one of his last roles - as M. Bison? Cheesy, CHEESY movie. But the dialogue was so bad that my friends and I incorporate it in everyday life.
F’r instance:
I mean, what’s NOT to like? And, let’s not forget one of my favorite lines. Bison (Julia) is going over plans for a “Bison City,” named after him. While looking at the plans, he says something like “I think the food court should be bigger. The major chains will want to get in on this.”
Raul Julia did the movie for his children. And it made me and my friends laugh ourselves to tears in the theater.
I agree on Waterworld. O.K., the premise was impossible, and it wasn’t a great film, but I found it entertaining enough to watch all the way through.
Also agree on Bill & Ted - IMO the first one was one of the funniest movies ever. And actually, I wasn’t aware that there were people who didn’t like it.
Here are my contributions:
“Falling Down”, with Micheal Douglas. It was unfortunately marketed in a way that made it look like some kind of vigilante movie, and kind of got criticized for that. But if you actually watch it, that’s not what it is at all. It’s similar to Thelma and Louise, where a set of circumstances forces the main character down a road of no return, but he’s not portrayed as a character with which we would sympathize. And the movie is as much about the clever cop who puts the pieces together to try to catch the guy as it is about the guy’s escapades. Not the greatest movie ever, but certainly deserving of more than the paltry two stars it usually gets in the TV listings.
And I know there are SDMB fans of “They Live”, because someone did a thread on it awhile back. I really liked that movie, and I know a lot of people think it’s total garbage.
Also “Robocop”. I thought it was surprisingly funny and satirical. The sequels were pretty poor, and didn’t add any original ideas, but the first one was great.
Last but not least: “Fast Times at Ridgemont High”.
Kung Pow: Enter the fist.
Stupid movie, but rather funny. Particulary the extremely gratutious product placement.
Crony walking across the courtyard of the enemy compound singing: “Taco Bell! Taco Bell! Product placement from Taco Bell!”. Around the time time, he passes a bunch of nameless, faceless foot soldiers sitting at picnic tables eat from big, prominatly displayed Taco Bell bags.
Ghost Ship. Even with the obvious failings (surviving in the Beiring Straits?), I love a good ghost story, the historical background, ocean liners and oh gods, the music. It’s just my kind of story, I guess.
Will have to second Kung pow. If you watch alot of old kung fu movies, you will find it absolutely hilarious. Plus the sheer crapiness of some of the shots were great. Like when steve ordeki(or however you spell it) was fighting Betty on the waterfall. They didn’t even try to make the transition between him and the original very asian looking actor. All you got was closeups of him, then wideshots of the asian actor. Classic.
I’m sorry, but I’ll never understand Starship Troopers. I get violent whenever I hear about that movie.
Another vote for Hudson Hawk .
I went to see The Alamo recently and thought it was just great. Very historically acurate and I loved the way they portrayed Davy Crockett and Santa Anna. But apparently hardly any one else agrees; the movie is 6th at the box office, tied with Johnson Family Vacation. 
I like Episode I and II as well. But that’s probably because I’m in love with Natalie Portman.
I guess Fight Club too, I thought people liked that movie.
Unbreakable and Signs are two of the best movies I’ve ever seen. I don’t see the flaws that any body else sees in these movies, especially Signs, if you paid attention to the movie you would’ve noticed that the whole water thing is explained pretty well.
Im another one who liked Unbreakable and Signs, as well as the second and third Matrix movies, I think people just expected too much.
I didnt like Pearl Harbour when I first saw it, but I saw it again just recently when it was bought for me and I quiet like it now.
Noises Off is one of my favorites. It’s a movie that you really can’t appreciate fully unless you’re a stage performer, though. Maybe you’re hanging out with the wrong crowd? 
A Bridge Too Far is a movie I like a lot, but the rest of the world seems to be–at best–indifferent to it.
I have only one word:
Vamp
What’s this? A two page thread on movies people like that critics hated and not one mention of Boondock Saints? It’s a great movie! It has great characters, one liners, humor, editing…I love everything about it, and I’m know I’m not the only fan of it here. It got quite the bashing at www.rottentomatoes.com.
I loved Street fighter too, but only in a “so bad it’s good” way. …so maybe that doesn’t count since I find it reasonable for critics to bash it, though it did get me wondering, just what is the proper way for a critic to reccomend a movie so bad it’s good? To give it one star and reccomend it to readers that love camp, or to not just reccomend it at all? I suppose if you graded movies on a 1-10 basis you could give movies a negative 1-10 for it’s “so bad it’s good” quality. In which case, I’d give Stree fighter a -10. All this talk about it even makes me want to buy it…
I too loved Matrix: Reloaded , and really didn’t get what people disliked about it (well, it did get of to a slow start, but beside that…). It had everything it’s prequal had.
I also loved National Lampoons: Loaded Weapon, and yet no one ever talks about it.
The Game is a pretty good flick.
Folks are mentioning a lot of movies that I thought were fairly popular with the average movie-goer. Or renter, in the case of Boondock Saints.
Nah…it’s one of the first I picked up when updating from VHS to DVD.
Of course the $3.99 price tag helped in the decision…
Actually, I know one other person who liked Gods and Generals, but he’s just one step away from being officially declared a “Danger to Himself and Others” so I don’t know if he counts.
Well since Starship Troopers, **Waterworld ** and the last two Matrix movies have already been mentioned I am willing to see that and raise you the following:
Robocop 2 - I liked it better then the first one since it was so much bloodier and more cynical and generally had a more dystopean feel to it.
Every Hellraiser movie - They may disgustingly gory but pinhead’s shear coolness well makes up for that as well as lack of coherent plot.
**Spykids 3d ** - It was a really dumb movie I will agree but it was still sooo funny. Especially Stalone trying to be funny, that was just priceless.