Eh, don't really agree, but people can have their preferences. FoP certainly doesn't rely on its IP any more than Velocicoaster does (for example). And Uni certainly has their share of stuff that basically relies on liking the IP to be able to get significant enjoyment - I mean, I've ridden Fast and the Furious and I don't know what the heck they were thinking there. Perhaps more relevant, I would argue that while Diagon Alley itself is fantastic I can't believe how much they ailed it in with Gringotts as a ride. I mean, a fantastic ride system and concept and you waste it just shuttling people between scenes from a movie?
Anyhow, I haven't experienced Hagrids (talk about a problem with ride reliability and lines - not issues unique to Disney) but I'd put the last 6 or 7 years of WDW at least on par with Uni in terms of new offerings. Certainly with nothing beyond 2022 planned for Disney, the years after will be all Uni (much like the period surrounding the opening of WWOHP and Forbidden Journey) unless Disney starts greenlighting and approving.