An okay movie. The animation style of Tom + Jerry and the other animals is not bad. And the classic cartoon in-jokes and antics are very nice to see. Very true to the original material. However it isn't without it's drawbacks. The acting on the human's part is very mediocre. The lines and story beats are very cliche.
De Niro's classic charm isn't enough to make this movie even slightly watchable. Every character delivers bland lines and humor with forgettable acting. Extremely predictable. Save your time and money, and watch a better movie