Any movie franchise that reaches its fourth entry runs the risk of becoming too familiar, no longer a special event but merely another episode in a never-ending series. That's how Shrek Forever After feels. If there were a Shrek TV show, this could be the two-part finale of, say, season 3. It isn't bad. It just doesn't belong on a movie screen.
Like a long-running TV series, Shrek Forever After assumes that we're comfortable with the characters and will appreciate some twists. (In other words, if you're not a regular viewer of the Shrek sitcom, now's not the time to jump in.) Shrek (voice of Mike Myers) and Fiona (Cameron Diaz) are happily married with baby ogre triplets. Donkey (Eddie Murphy) and his family come to visit regularly. Life is pleasant and pleasant.