The one thing that struck me most of all about this whole thing was that kids must grow up funny in the US. The average age of Young Justice, at a guess, is about 16 to 18. As a biologist, I know we keep growing (maturing) at least until we are 25 BUT most of that is just little tweaks and refinements.
I am fundamentally the same as I was at 16, no taller, no hairier, no bigger built (in fact I was a muscle bound hunk at 16, and now I'm a fat git). My face matured a bit, and in ten years I've started to go grey, but that's about it. I didn't grow one or two feet taller, or broaden out, very few of my friends did either, and my female friends certainly didn't quadruple in cup size (more's the pity).
It does happen, but only to a few. I thought most of YJ looked pretty grown up under most artists anyway, but, suddenly, they all lengthen and widen and all the women become pneumatic...it's a little odd, that's all.
Story-wise this is an odd little number too. We have the suck-ass Old Justice (just die and never come back, except to do a baseball story on Myrrgh, that was cool), the youthified JLA, and a suddenly mature Young Justice. Some of this stuff is painfullybad, but of a lot of it is either very, very good, or just extremely funny.
There are some scenes with J'on J'onzz and Green Lantern, amongst others, that are so funny you'll wet your pants, but they make this whole she-bang worthwhile. The whole JLA becomes pubescent and ratty, all except for one - dear old Bruce never had much of a childhood after his parents' death; Batman, though young, is still the grim soul we know and love.
A great tale that's a lot of fun to read; plough through the cringe-worthy parts to the real diamonds in the you-know-what. Oh, and look out for Li'l Lobo - I wonder if Li'l Lobo's "li'l lobo" has gotten even li'l'er?