I guess the downvotes might be a combination of the thing post being a lot more in the idea stage than a worked out solution stage and it being about rating movies, which as itself isn't a very relevant topic.

The general idea of working out preferences using vectors instead of scalars does seem like a forum relevant topic to me, but your post leaves the details of making an actual working implementation, coming up with interesting use cases beyond movies and figuring out how the vector approach would be a significant improvement over a scalar approach in them up to the reader, so it's a bit thin as it stands.