It's probably just the lyrics, not the musical content. Popular music is mostly the same. It's clever lyrics and good meter that's more important imo. You can just dump something in from GPT or use Suno for it, but unless you spend some actual time on lyric composition, it will absolutely be campy as hell.
Suno songs also sound really poor from a technical perspective. The high end of the frequency spectrum is always very washy, reminiscent of the days of 128kbps mp3s. It sounds ok in isolation but it's very noticeable when it's thrown into a playlist of professionally mixed/mastered music.
Yeah 4.5 definitely improves a lot, but I can still hear washiness in the high end. Probably not noticeable to most in isolation or poor audio devices like low-end phone speakers, but would be very noticeable on a good soundsystem in a playlist with professional songs.
It still doesn't capture meter or phrase structure well in classical songs, and there are a lot of weird artifacts. It's better than the old models, but there's still a long way to go.