Uh, wow, I didn't realize there was a Gravity Rush 2 hate brigade until now.
As someone who liked the original Gravity Rush, I thought Gravity Rush 2 was great, but there are some frustrating missions and optional challenges in there for sure (fucking stunt double sequence). But if anything, GR2 is even more charming than the original, and the plot Goes Places. And I never grew tired of the online treasure hunt challenges the game would throw at you. Combat is very similar to the first game, though you have the different fighting styles to add a bit of flavour. The environments are gorgeous, and the game looks great in general. I think if you liked the first game, you'll definitely get something out of the sequel.
That said, I'd still pick Persona 5 over Gravity Rush 2.