The Descent - 2006
I'm a sucker for horror flicks... the good ones. I didn't have a ton of interest in this movie until I saw what it was getting from www.rottentomatoes.com.
The Short Version: Don't let anyone tell you about it and DON'T watch the trailer. Just go see it if you enjoy scary, tense movies.
The Long Version: *Minor Spoiler Warning* This movie had me long before the crawlers ever showed up. I was quite tense early on (and not from the "boo" cuts). I don't consider myself claustrophobic, but I was feeling very confined. It would take a LOT for me to crawl down the first shaft they went through (the one with the weird water at the button hook turn). I just don't need thrills THAT much. It's easier to speed past a cop or punch a biker. According to "The Descent," it's safer too.
The Crawlers were well done for what they were. neckid big versions of gollum are only so scary. The real tension for me came from the question of whether or not they would find their way out, not if they would survive (it's a HORROR movie! Only one of them can survive! It's a basic rule!). The director did a good job of maintaining that as the primary goal.
Again, I could have been very happy without the creatures. I was sucked in and tense long before they got involved. That said, the monsters were handled well. The make-up was well done and looked great under the very limited light they used. Speaking of light, I was glad for all of the shots without any extra lights. Letting the oppressive darkness loom heavy was excellent. It's almost as though the dark was the real star of the movie.
My one small complaint was the regular flashback/dream sequences. She's got her demons. I get it. I don't need it beyond that. Let's skip to the part where people die... please!
To Sum Up: If you like your horror bloody and fast, this is a great movie for you!