On Monday, Michelle expressed her thoughts on bad scripts and how the best acting and directing will always fail to make up for a bad screenplay. In some cases I'd probably agree (Wolverine Origins, for example, and Smokin' Aces is STILL probably the worst movie I've ever seen, if not the worst movie ever written), but I think there are some exceptions to that rule, both from the perspective of culture, and according to my own personal opinion.
First example: Army of Darkness. I thought it was clever and maybe almost funny, but I didn't like it. I am the only person I have ever met who's seen that movie and didn't absolutely LOVE it. On that note, I HATED Bubba Ho Tep, and, again, I can't remember meeting a single other person who hated it. On both of those movies, the scripts were lame (I'd give them maybe 2/5 if forced to rate them), the direction made them FEEL like they were searching exclusively for a cult following, and the acting was pretty much what you'd expect from any low-budget, post-grad film from an untried director (which Sam Raimi was NOT). Still, people LOVED those movies and think they're some of the best films ever made (while admitting that they're not blockbusters).
Second example: The Matrix. Stop, think about it for a second, then look back on the writing itself. All on its own, that movie had ONE thing going for it: special effects. It looked SO COOL. But with the exception of Laurence Fishburne, the acting, again, was sub-par. However, terrible writing and awesome effects aside, the directing was brilliant. The way the scenes were cut, the angles of of the camera, lighting, sound, and soundtrack, all made for an amazing movie that took TEN YEARS to make a writer like me (admittedly a picky one when it comes to writing) capable of even NOTICING the utter failure that WAS the script itself.
Third example: Every James Bond film pre-Daniel Craig (and even a few of those). The plot lines are far-fetched and unbelievable, dialogue contrived and often stiffly delivered, and characterization of everyone BUT Bond is shallow and sometimes offensive. But I've enjoyed every Bond movie I've seen, even the ones EVERYONE else hates.
Each and every one of those movies would've been better with stronger writing, but (aside from the first example), all of them were consistently successful. My point, really, is that, while great writing makes for better movies (and, of course, better books and comics), it's not ALWAYS critical to entertain an audience. Of course that shouldn't stop writers from trying to get better, and there's never an EXCUSE for horrible writing. Still, bad scripts can make good movies. It's a lot harder for the director and actors, but it's possible.