Well Court of Shadows doesn't want you to play Faeries, you're still playing shadowrunners hired by Faeries. Not exactly the same thing.
I like the book. Not to the point of having my players travel to the Faerie plane yet, but they've been doing a couple of runs in the real world for various factions of the Courts. I think it works well with the whole Tarot metaplot. Sure, it won't be everyone's cup of tea, but one thing I like with Shadowrun is the variety of stories if offers: you can have corporate schemes, AI masterplans, Bug threats, dragon plots and now Fae shenanigans. Court of Shadows is just another possibility, nobody is forcing anyone to use it if they don't like it. But I for one like to see Shadowrun attempt some new things, rather than just recycling the same old tropes over and over.
Regarding the OP, I think it's important to remember the book describes a Faerie metaplane, not Ireland. The Courts are a mix of various interpretations of Fae across the world, not just the Irish ones. There are Tuatha dé Danann, sure, but also Japanese Kappas and African Kishi. So I don't think the writers intended it to be any sort of commentary on real-world Ireland (especially since, in Shadowrun, it has turned into a totally different country aka Tir na Nog).