Originally Posted by metaphysician
I think your fault is your starting point: that Ice Age and Madagascar can be discarded as "average to below average." In terms of quality, that may well be true. . . but they are entries in successful franchises that are specifically targeted at kids and families. That's a recipe for higher gross numbers, because of all the kids who will drag their parents to the movie ( and vice versa ) based on prior exposure to the franchise.
Well, IM3 is a part of a very successful franchise, so that is there... Itīs also a family friendly movie, much more so than Batman movies for example (acceptable for kids) and also more than the rest of MCU movies prior to the Avengers (all of which have been pretty fantastical and therefore "scary" for GA).