by Mary Pols
Special to MSN Movies

Ranking Pixar movies is like deciding which oyster is the tastiest. Or if you're not into shellfish, which tropical vacation spot has the best sand. All 11 of the animation house's feature films (the 12th, "Cars 2," arrives in theaters June 24) are very good. Most of them are fantastic. The "Toy Story" trilogy is the "Godfather" of animation -- without any weaknesses. (The third "Godfather" introduced the world to Sofia Coppola's Mary Corleone, while the third "Toy Story" brought us Ken. No contest.) Still, as the Emeryville, Calif.-based creative giant celebrates its 25th anniversary in business in 2011, we decided to attempt a ranking. Would the old adage about getting better with age apply? Was there an adolescent slump? Does "A Bug's Life" have a shot at the gold? Read on, and remember, being at the bottom of this list is not an insult. Just as something has to be seventh on the list of Seven Wonders of the World, something has to be the least wonderful Pixar movie.