I saw it yesterday with my neice (11) and nephew (8). They loved it and want to see it again.
It definately was much funnier than G-Force. Some adult type humor and some kick you in the groin kid humor. And some cutsy stuff tossed in too.
Might be a bit intense for younger kids, because of the 3 bad aliens, but nothing really bad, they just talked about what they would do with the You-Mans.