I'm a huge Tolkein enthusiast. I've read much of the supplementary material, listen to several podcasts by Tolkein scholars, and would already be getting my Master's at Signing University (which specializes in Tolkein and medieval literature) if I had the time and the money. I can't experience any version of Tolkein's works without comparing them to the texts, and there are places where RoP just fails for me to capture the core of the original or the themes Tolkein was exploring. The Jackson movies weren't perfect in that regard either, although it ultimately didn't harm my enjoyment of them (the Hobbit films, though...)
Beyond that, I'm also a simulationist, and care deeply about setting consistency and narrative logic. I feel they are necessary for immersion and to have an emotional stake in the characters and the plot. In many places throughout both seasons (although it was certainly worse in season 1) RoP just falls down in that regard, sometimes pretty hard. Fun, pretty fantasy show just isn't enough for me to ignore these things.
All of that said, I am enjoying the show. I just refuse to do so uncritically.