Yep, the first 2 episodes are quitre mediocre, especially if you're not into typical teen dramas, as they mostly serve building up characters, but the series quickly picks up pace. It is in episode 3 when the show truly finds its way, and episodes 4-6 are just really, really good in showing the naivity of teen rebellion.
Keep in mind, however, that this show is NOT similar to the movie from 2008 or the book. It is just loosely based, and tells much more about naive idealism than about left-wing extremism. In fact, I'd say the show is more critical of the far-right than left wing.
Give this series another chance, because it truly does pick up and deserves a season 2.