I don't know about a movie though.
Part of the magic of the Beverly Cleary books is that they aren't movies and they aren't cartoons. To discover them, you had to read them, you had to spend time and lose yourself. It was a magical experience and that doesn't happen with every book or, sadly, even with most books.
If the movie attracts an audience for the books, I guess it's a 'hit.'
And certainly there are probably Beverly Cleary readers in small towns that, due to the movie, will be able to find the books in their local drugs store.
Believe it or not, those aren't minor things.
I remember the joy of going through the Cleary books. Thinking I was done and discovering Tales of a Fourth Grade Nothing, for example. I didn't dislike Judy Blume by any means. But Cleary was like Bloom but, to me, not afraid to invest a lot into a minor character that is only briefly around. I always felt those types of characters were mere stick figures in Blume's work (I like Blume's work) but the perspective and where a character was coming from were as important as any other detail.
If you have a child who's never read Cleary, take her or him to see Ramona and Beezus and see if they don't end up hooked on the books. My bet is that your son or daughter will enjoy the movie and then find a book and fall in love with that before working frantically through the rest of Cleary's books.
Here's C.I.'s "Iraq snapshot:"