The love story here is cute and Tim Robbins has some nice moments, but the reason to watch the movie is Walter Matthau as Albert Einstien. (Meg Ryan has a typical Meg-Ryan-nice-girl performance. What that means, exactly, is up to the reader to decide.) Matthau makes the physicist humble, scheming, fun, and generally endearing. Plus, he and his peers have most of the great lines (e.g. "Don't let your brain interfere with your heart".)
