Stupid. Stupid humor. Stupid reactions and counter reactions from the characters. Stupid, cliche`d plot. Stupid minions; they only exist to provide a lame, failed distraction from the feeble fluff that is called the substance of the film.
In one phrase, a waste of time...
... and a waste of the animators' time and sweat. The brilliancy of true humor doesn't exist in hardly any aspect of "Despicable Me 2," and there are too many examples in the film for me to pinpoint which one to give you, probably the whole kidnap scene near the beginning -- even the once-famous minions are now tiresome balls of yellow with the humor and reactivity of a seventh-grade boy (not like I hate seventh-grade boys, in many ways their better than seventh-grade girls, just their immaturity is a problem). The first movie was okay, but this just spreads mud over the whole image of the films' story and characters. Indulge yourself on "Megamind" or the satire of "Over the Hedge."
Or, plant your kids in front of the Planet Earth series; much more educational.
For the sake of being specific on content, I think that the sexual innuendo, however very indirect, is way too abundant to make this a good pick for young kids. Parents have also complained that the action can be a little to daunting for kids to process, so take that into the weighing of whether to see this film or not.
It is worth mentioning, before closing, that I have been developing into a picky movie viewer the past few years. My tastes mainly range into critically-acclaimed action, foreign dramas, political thrillers, and other movies of similar genes; cartoons rarely fall among my list of favorites unless they intelligently satirize society or events or have an original plot structure. Or their foreign. This should explain, in part, my piercing dislike for this "movie." Everyone has a different perception of humor, so for all I know you might perceive a sneaky, hidden element in the devices that make up the mix-of-ten-wearily-retold-plot-lines story and think this movie is utter hilarity; don't take my review too seriously.
After some reflection, before publishing, I feel beholden to admit that I didn't watch the entire movie. I got fed up half an hour into the mess and found an Israeli drama on Instant Play to help me bide my time. My dad later came into the office to affirm my impressions: not good. His watered-down answer is very typical of him. Note the phrase "watered down," to imply there is more, and an adjective that pretty much describes the intelligence of "Despicable Me 2."