That's weird on many accounts... how one, how do you manage to not grow up with Tom and Jerry cartoons? (Mind you, episodes I remember most clearly from my childhood where the late Hanna & Barbera studio ones, the awfully bland ones where they're actually friends. It makes sense since I always liked Tom more than Jerry, that as a kid I would remember a serial in which he doesn't actually get hurt.)
And if you don't know the characters, what do you make of them in the movie? Do you think "this story about the orphaned girl is kind of interesting, but why did they throw this pointless cat and mouse in it?"