The Good: With the exception of one actor, the acting was generally believable. The cinematography was decent overall.
The Bad: A dragging 30-minute exposition that could have been accomplished in 5 minutes or less. This is a movie not a novel; don't dialog us to death. As time went on I felt my interest in the characters decrease exponentially which, I imagine, stood in opposition to the director's intent. Ultimately, however, it's difficult to tell exactly what the director was going for. Regardless, the exposition never took me anywhere emotionally, and that left me with a "who cares" feeling that persisted throughout the majority of the movie.
Character believability also had issues. Without giving too much away, I thought the characters' reactions to the corridor seemed unrealistic. However, I fault the script more than the actors for this. Arguably, though, their reactions could be attributed to the affects of the corridor itself, which would be consistent with the "plot." Nonetheless, it made for awkward viewing and I found myself silently begging the director, "get to the point."
Additionally, there are episodes of violence in this movie that were unpalatable. Mind you, I'm a horror fan and can tolerate a fair share of gore. It would be incorrect to call the violence "gratuitous," because I think the violence was necessary for the director to get where he wanted to go. The problem was, the place he went was not fun, exciting, new, or even that interesting.
The Ugly: The "hair" and makeup. I mean, wow. It's not often makeup has a hand in sinking a movie, but when you see the bald character in the beginning of the movie you will understand my point. It was so bad I think it skewed my impression of his acting ability. I've read others comment about the special effects. I didn't expect much in this area so it wasn't as big of a deal for me. If you're a stickler for good special effects, you might find yourself frustrated.
Overall this movie felt like a bumbled attempt to stitch Dreamcatcher and Donnie Darko together and call it "art" under the guise of a psychological thriller. The thing about psychological thrillers, however, is that you have to get the viewer psychologically invested. This is where The Corridor failed.