Having seen the number of dissing reviews on the IMDB, I just had to put in this review in defiance, as a chap who watches a movie to enjoy it rather than blam it.
The plot is simple. Garfield, fat lazy lasagne-loving telly-addict cat is living his very simple life, when his owner Jon get a new pet from his vet girlfriend, Liz. A puppy dog called Odie. Odie quickly turns Garfield's life on end and the two are always quarelling over their hometurf. Then Odie is kidnapped by an evil TV showman and Garfield must face his guilty conscience and rescue him.
While not the most brilliant of movies, Garfield is still hilariously funny and you'd have to be incredibly sour not to laugh. The special effects are brilliant - not just the CGI Garfield, but the whole facial animation with the other animal characters. The way that Garfield portrays moral developement is also good and I recommend this as a truly delightful family movie.