I actually watched this last week but just got around to writing the review.
I really enjoyed this cartoon. So far I think it is on par with Justice League Unlimited as far as superhero cartoons go.
Basically, the premise is a group of teen superheroes band together and go on covert missions that are too public for the Justice League to handle.
I thought the first two episodes (aired as a single one-hour episode) was the right blend of dialog and action. If you liked the animated movie Batman: Under the Red Hood then this cartoon will be right up your alley.