I say you do you. We are absolutely allowed to say, based on what we have heard or read, that something does not interest us. That is not the same as saying that it isn't actually good--because you can't make that claim unless you see it. And I don't think you have made that claim. Our tastes and opinions inform how we decide how to spend our time and dollars. On the other hand, I am sure we can all think of something we were sure we'd love/hate, saw it, and felt differently than we thought we would. So that can happen too.
I saw the show late in previews before reviews, based on having an affection for the book and story, in conjunction with re-reading the book in a club with some friends. I happen to agree with you that I was not a fan of the choice to cast adults as the children. And as another poster mentioned, there is tons of narration to the audience, a theatrical device I loathe. So if those things bother you, then why spend your time and money seeing it? I didn't hate it. I wouldn't tell people to go running in the other direction. But I did feel some buyer's remorse paying full price (for a not very good seat because it was so well sold). And when I read all the glowing reviews, I just thought, okay they see something I don't. No big deal! There are plenty of shows to go around and be liked or disliked by many.