I have never seen the original play or movie, so I'm not making a comparison. I think the main problem of this movie is that it lacks in rhythm. It felt too long despite being only an hour and a half. However, I still had a good time watching it. There are some true laugh-out-loud moments and everyone gives a good comedic performance. Also, the costumes and sets are gorgeous. Apparently, there have been a lot of changes from the original story, but I thought this story was good. My rhythm issue came more from some of the dialogue and the editing, I think. You won't be wasting your time watching it, but don't expect a masterpiece.
Review of Blithe Spirit
