While there is some comedy thrown in every now and then the show is still built around strong character development and serious undertones. They're not even close to reaching Teen Titan levels of humor, which while I enjoyed doesn't entertain me quite as much as a mature story with growing characters like Young Justice does.
From what I've seen so far it's got all the makings to be as good as Justice League was, maybe even better. Kid Flash and Superboy have already gotten my attention, but the entire cast is just as likable. Gonna be keeping tabs on this one, and thanks Cross for keeping us all up to date with the latest info and such.