I couldn't agree more. My plan was to stay off the TV portion of the forum and just try to watch the shows and see where they go.
Was willing to give the first season a pass, didn't think it was horrible and some of the nonconical areas didn't seem like something a person couldn't live with (In hindsight how wrong was I?). But after finishing S2 E1, especially watching the trailer for the rest of season 2, and I'm left feeling frustrated and angry. These are wholesale changes to a wildly successful franchise that feels more like fan fiction. Why not just stick with canon? There's fifteen books! Look at how well the Dune movie is doing, in part because they aren't making sweeping changes.
Haven't read past this post, but I'm sure there are going to be the people who say don't watch. Fine, I get it. But, like you, I'm such a huge fan of these books and I'm disappointed that the show isn't honoring them, as they should be honored. Like many, I grew up with these books being a teenager in the late 90's, so they have been with me for thirty years and many re-reads. Watching what is being done to them is upsetting.
Watching S2 E1 I said aloud, "Did these people even read these books?", it doesn't seem much of a stretch to answer no.