People have seen it, at least the first few episodes. Moreover some people who care are in contact with people inside the production crew. The leaks against the trailers have so far been accurate. I can certainly provide links to discussions, though by the sounds of it no one is interested in that.
It stinks there's such intolerance against those to whom this is important, the derisively named "fanboys". I think the only book that has sold more copies and has had more translations into other languages than the collected works of Middle Earth is the Bible. So, we're not talking some fringe group. With the recent bastardization of beloved franchises, fans are rightly concerned. And given what's been leaked and what's been seen, they have just cause.
Tolkien and his son Christopher WERE notoriously protective. That's why the rights were sold to Amazon quickly after Christopher's death. The remaining members of the estate care only about the millions and not the legacy. What they are allowed to use and what they aren't is very specific, but if the estate doesn't care does it matter?
Tom Shipley the Tolkien scholar was fired for telling Amazon they were "polluting the lore" so there's no real monitoring or interest in adherence to either the lore or what they have rights to.
Obviously anyone can watch and form their own conclusion, enjoy or not. But there are millions who care deeply about that world and there's every indication that world is going to be warped and twisted. Changes can be good, but it's equally valid to say changes can also be bad.
Who is Amazon making this for anyway? Isn't it a better business model to present a product to the tens or hundreds of millions who read the books, watch the movies, buy billions in merchandise that they will like and demand more of?