Tripping my fingers through the dictionary today, this gem came to light:

TURBID as an adjective, is:

1) originally meant to describe liquids as being thick, opaque, cloudy and suspending matter in the liquid so that the liquid cannot be seen through clearly.

2) However, it can also be used figuratively to describe anything that is unclear, clouded or muddied.

In usage, it could be said "The plot of the movie was so turbid as to obscure the point of the movie."