Using the car analogy, I think you might be confusing car ownership with car manufacturing, and similarly story enjoyment vs storytelling.

While you might love a car with bad paintwork, making a car with bad paintwork IS bad car manufacturing.  Bad as in shoddy, deficient or inadequate.  It may not be a critical flaw but it is invariably a flaw.  I can think of no way to argue that a bad factory paint job is not a flaw.

Similarly, poor plotting is invariably bad storytelling.  It might not be critically bad storytelling, but it’s never a good thing.

I used subsets to to express the notion that while all examples of poor plotting are instances of bad (deficient, shoddy, inadequate) storytelling, not all examples of bad storytelling are plot problems.