I thought this was fantastic. It actually surprised me and surpassed my expectations for scripting - even by Bruce Timm standards, this is a mature, and generally comics level storyline. I liked how they didn't shy away from the GL Corps being more like soldiers than goofy super heroes (complete with alien GLs mystified by the concept of a secret identity). And they didn't shy away from the Guardians being distant and alien, not the kind of "leaders" you can entirely look up to even if you agree with their philosophy.
Also, people are going to hate on the visuals because of the smooth and abstract style but this isn't a cheap show. The detail, animation, and especially design work is all top tier. Lots of really striking visual design, and the fact that it's going to be so space-based and involve loads of technology, makes the use of CG the right move IMHO. Replicating most of the Cool Shit (tm) involving the space scenes, space fights, the ships, and epic scale machines like the Red Lantern dropship-bomb, would require a far bigger budget in traditional animation. Young Justice, for all it looks great most of the time, is very strained to portray stuff like that.