Whether it's terrible music or not is somewhat irrelevant. Plagiarized music doesn't sound worse than the original.

What seems to matter more is the story behind the work. Basically, if the author is a grifter trying to make a quick buck, then it's slop. You can make an argument that Taylor Swift qualifies as slop, but most people will disagree. The public will be the final arbiter. All I really want is a big red lever to cast my vote.