MIB3 was family friendly on all counts. My 55 year old mother loved it as much as my 12 year old neighbor. The aliens, the action, and the plot were right on par with the high expectations set by the first two Men In Black films. There were cute moments and there were exciting moments. The right amount of suspense and enough twists to keep you on your toes without confusing viewers. I definitely it enjoyed it as my second IMAX 3D experience since Tron: Legacy. The 3D was incredible and done in such a way that really captivates. It is not dizzying or headache-enducing, which is a nice change from what 3D often leads to for me. There were two brief, 3-second moments in the film when the 3D was off but it was otherwise above par.
Pros well paced, great story, great actors, 3d done right, family-friendly