Here is how I view Paul's songwriting
If you took the riffs out of jungle scom PC brownstone RQ etc etc and the song ls started with the vocals and had the same chord progressions.. that's a paul song but he isnt able to write the classic iconic rememberable riff that make songs classic
I could give Axl a bunch of chord progressions to sing over and he could make a decent album from it cause hes Axl

Anthony explains at the end how much they love and respect GNR so def not a diss

Not really in the riff department

Stephen King DR Sleep and MR Mercedes. Both excellent