I just watched Garfield today. Even though I wasn't expecting much in the first place, I felt that it was a disappointing.
The first half of the movie was very, very slow-paced and served no purpose other than to showcase some lame & uninspired jokes/punchlines. It only picked up halfway when they introduced an actual plot; only then I started paying attention.
I liked Odie a lot (he is such a cute pup!) and Jon is a nice guy. On the other hand, Garfield was potrayed as overly obnoxious and I ended up hating him (even though I did enjoy the comic strips when I was younger).
The movie is probably targeted at fans only. Others need not apply.