I think her rapping style/voice is offputting. Among other things. Perhaps it's too hook-heavy and doesn't focus enough on her actual verses, therefore, making Iggy an afterthought on her own album. Like with Fancy. We all know the only reason people like the song is Charli's hook, so that puts Iggy at a questionable and disadvantageous position because she's not at the forefront of the better, more instant songs.
And the album title.