I've seen the movie, and mostly because I love rats. I thought it was mediocre overall, though I did not dislike it; I admired Glover's performance and enjoyed watching the rats. If you have the edition of Roger Ebert's Movie Yearbook with his review of Willard, my comment (David Mitchell) is the one in his "Movie Answer Man" section.
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"And lo, the beast looked upon the face of beauty. And beauty stayed his hand. And from that day on, he was as one dead."