For me there is no middle ground when it comes to movies, or any medium of literature. It either hits what it was aiming at, or fails.
You can usually discern in the first parts of the movie what the creators of a movie were aiming for. Sometimes you can't untill the conclusion, and that's fine.
If a movie has a highly implausible premise it can still work if it doesn't take it's self too seriously. For example Back to the Future, a fanciful and implausible plot, but it was a very amusing movie, because that's what it was trying to be. Had the creators of Back to the Future tried to go a different direction, say scary, or serious, or suspensefull, it would have failed.
In the suave system, there 3 ways that a movie can fail, but only one way it can succeed.
1. The movie is trying to create something that is lame, and it fails. These movies suck.
2. The movie is trying to create something that is lame, and it succeeds. These movies suck. For example, Power Rangers, Bride of Chucky, Air Bud, even if these movies succesfully conveyed what they were going for, they would still suck.
3. The movie that is trying to create something cool and fails. These movies suck.
4. The movie that is trying to create something cool and is successful. These are good movies, they are rare.