Made the mistake of reading the book before seeing the movie; the movie, as a consequence, couldn't possibly live up to my expectations. Nor did it. But that's not a put-down. While there were some things that irked me (the mother rat's humble "thanks" at one point, the rubber rats all too much in evidence at the birthday party, etc.), Bruce Davidson and Ernest Borgnine deliver solid performances that help keep one focused on the twisted relationships that are the core of this film. (Elsa Lanchester as Willard's mewling mother also deserves mention.) I don't know how this one would hold up today, but, back in 1971, it was a must-see.