A bored and domesticated Shrek pacts with deal-maker Rumpelstiltskin to get back to feeling like a real ogre again. But when he’s duped and sent to a twisted version of Far Far Away — where Rumpelstiltskin is king, ogres are hunted, and he and Fiona have never met — he sets out to restore his world and reclaim his true love. —IMDb.com
For all the bad thing that people say about "The Third", at least people still remember that film! Shrek Forever After is probably the most forgettable out of all the Shrek films for me, with its recycled "It's A Wonderful Life" plot, paper-thin characters who have lost nearly all of their appeal and pretty standard animation. It does have a funny villain, but that's not enough to save it from being bland.
The whole Alternate Universe plot device made Shrek Forever After feel more like an episode of a mediocre and failing TV adaptation of the first two great movies. Shrek Forever After does have its moments, just not as many as the first two have. I don't think I'll go as far as to say this one shouldn't have been made but I'm glad they're stopping right here.