Not good

Yes, having it heard it once, I would have to say that I agree with this Slate criticism of Taylor Swift's new song.  Wisely, it even covers the possibility that it is a send up of her media image:  

“Blank Space” worked as a light-hearted tribute to Swift’s tabloid reputation as a man-eating cyclone of drama; “Look What You Made Me Do” is neither fun nor funny enough to make for a satisfying meta riff on her reputation. The narrator sounds more bitter than self-aware and, given Swift’s history of well-placed disses, the story sounds too close to the truth.

And no, I don't actually follow her feuds at all - just as I know nothing about the Kardashian family except for sometimes seeing photos of the ridiculously disproportionate butt of one of them.  But Swift can write some terribly likeable songs, and one can only hope she avoids the self destruction that's so common with pop super-stardom.