Just saw this with my 9 year old who loves the books.
All I can say is if you're an adult, be prepared for wishing you had 1.5 hours of your life back. If your a kid in their target demo, you will love it.
It was for me mind numbingly boring and not remotely funny. I enjoy a lot of kids movies (Pixar stuff, and all the similar style movies). They alll knew how to appeal to both kids AND parents and many succeeded. This movie failed completely in appealing to the adults who take kids to see this.
No way I'd pay the kind of prices I see listed here to own it, not even at half these prices, We can wait for it to hit Netflix if my boy wants to re-watch.