But RoP is very clearly marked as "based on", not as "Tolkien". It's right there in the opening sequence. That is the main reason that I have much less heated reactions to RoP than to Jackson's movies. It has been very clear for me from the beginning that we are not getting a story that Tolkien wrote, but a gap-filler.
My main problem with RoP feeling or not feeling like Tolkien, is the mystery box kind of storytelling that I think was too much of a feature, especially in the first episodes. And I don't mean the big mysteries - like who is Sauron, and who the Stranger is. But the smaller, to me completely unnecessary ones. Like Elendil not introducing himself to Galadriel and Halbrand on the ship. Or telling them where they are going. That feels so opposite to how most of Tolkien's characters acts. Even when we meet Aragorn the first time at Bree, he gives Frodo a name as almost the first thing, even if it is an alias. Besides, with how every story is spoiled up front in the Silmarillion, the secrecy feels rather off to me.
As to how well the first season sets up the next - it is clearly not meant to resolve any mayor plots. I guess time will tell whether it works as an introduction to the rest or not, whether that means plot-wise or in manageing to capture their audience. They need to leave their viewers wanting to see more, or they won't come back to see the rest.