I don't really think its analogous. I can appreciate a movie for what it is, and still not consider it a great movie. There are so many different genres of music out there, and I'm sure each one has its own subset of good and bad music. A closer analogy might be I might not consider an instrumental song great. I can appreciate it, but in order for it to be great it must also have great lyrics. I don't believe that to be the case, by the way, but its a closer analogy.
I just think an action movie can also have a decent plot, and while the action was A++, the plot was at a much lower level, and that is where the film lacked in my humble opinion. Still a good movie, and still worth watching, but not (to me anyway) a great movie. The dude playing the fiery guitar in the red pajamas was pretty cool though.
Can you conceive of a situation in which a more complex plot would actually detract from a movie? I think Halloween and Jaws are great examples of that and I would put MMFR in that category as well.
My point is that a film having a "decent plot" isn't necessary for it to be good, great or even among the best of all time because films aren't reliant on plot. If you require them for your own tastes, then you're cutting out a ton of the films that have been produced.