My opinion on RP2 is that it was only written because of the success of the first one. I can imagine the publishers insisted that Cline write a follow-up to capitalise on the success of the first. All the culture references seem to need explaining (widen the market to those who were not there at the time), the story is a repeat of the the first book, and the ending is particularly poor. One of the characters also puts Jodie Whittaker's Dr Who ahead of David Tennant's (unforgivable). There's a few other SJW tropes which date already, but it's pretty much the first book again, but without the charm.
The first book I felt was a love letter to the era, the second is for love of the money from writing a sequel to a hit book. It has no soul.