Reading these replies and you'd think HN'ers have no fun (or feelings) at all. The movie is funny, clever, clean (good for families/kids), emotional, and has important lessons and metacommentary that adults will enjoy. Not to mention the irony of the plot with what happened to the movie in real life. Go see the movie.
Princess Mononoke & Spirited Away (and also Kiki's Delivery Service because it was a package. Not that it's bad, but not as important to me as the other two)
Into the Spider-Verse, for breaking away from the 3D animation movie style
I'll have to rewatch Princess Mononoke; I haven't seen it since it was in the theater in the US. I remember not liking it as much as the other Miyazaki I've seen, but I'm a different person today.
My 5 year old spent the whole time laughing. We have the expression "grow up!" that we tell kids. Sometimes I think we need the opposite expression for adults who are peeved when cartoons don't make them laugh.
To me, this seems to be an expectations issue. I thought it was going to suck. It's a live action and cartoon mix about looney tunes, itself a broad and very meh cultural artifact IMO. Compared to my expectations, it was funny and good. It seems that you had very high expectations for it to "elevate the genre", which ... I struggle to understand why.