My wife was in the show a few years ago, and she liked it well enough when she saw it, so I gave it a shot. It's not exactly good, but there are some surprisingly poignant moments in it. This probably could have worked, if they had just accepted that CATS is CATS, and let it be CATS, instead of trying to mimic the tone of CATS while inserting modern jokes and slapstick and pretending it has a plot and a subplot, which kills any flow it has. And they do that for a third of the film, and then just sort of drop the approach, which was a good thing, but it feels really uneven and awkwardly paced as a result.
It's pretty much all spectacle. Visually, it's pretty solid. The effects I saw were good except for the miniature creatures; mice, cockroaches, etc, which are designed to look like people in vaudeville costumes. The dancing and movement is pretty well done.
The movie tries to give everything that happens in the show a broader context, but not via dialogue, just by sort of placing a scene in context. And that works about half the time.
The numbers that they have to nail, they absolutely do (except for the first one, which Hooper can't figure out how to shoot). This might be the first time I've seen "Magical Mr Mistoffeles" with an actual point to it.
They combine/reduce several sets of characters to streamline things. Victoria takes a lot of the roles other characters have in the show. Acting is okay. Rebel Wilson is very, very hit or miss, James Corden is solid, Judi Dench is pretty good and Ian McKellan is excellent. Robbie Fairchild, who plays Munkastrap, really commits to it and he was one of my favorite parts. Jennifer Hudson absolutely nails the last part of Memory, but isn't that great the rest of the time. They weirdly don't do much of anything to flesh out Grizzabella, they give Macavity a subplot instead, but it's super predictable, and he has weird magic powers for some reason.
The hate it's getting is a bit much. Either you like and buy into the concept or you don't. Worth a watch if you're a decent fan of the musical, but if you've always hated it, this won't do much to change your feelings on it.