Absolute Wonder Woman is the BEST of the whole line.
Absolute Martian Manhunter is very good, very creative, excellent art. The writing is clearly trying to be a Moore/Gaiman/Morrison kind of thing and barely kind of makes it (Camp is nowhere near the level for such an attempt), but the art is strong enough to carry it.
Absolute Green Lantern starts out pretty mediocre, with a non-linear mystery box story set in a small town, but once it breaks out of that, it gets a lot more interesting. It takes the color spectrum and turns it into something philosophical and spiritual. It suffers from using Jo as the protagonist, and Hal in a weird position of half unwilling antagonist, half mystery box in himself. But again, once it breaks out of the original setup, they and other characters get more to do, the book explores their backstories and personalities, the lore starts to become legible, and it all gets a lot more interesting.
Absolute Batman you already know, it's fun, it's balls to the wall, keeps a good momentum, shuffles the toys in the toybox pretty well, and there's some excellent moments here and there. I don't think it's revolutionary (despite it's revolutionary success), but it's a great ride.
BUT
Absolute Superman is mediocre to bad. It has some very interesting concepts but it wastes it all in heavy-handed social commentary.
Absolute Flash is the worst of the bunch. Not bad but just nothing special. Doesn't do anything truly interesting with any of the elements it uses.
So check out Wonder Woman and Martian Manhunter, maybe Green Lantern if you have the patience to get past the meh first arc.
