I had less of a problem with how grim it was (as that really comes with the territory in a story like this) and more of a problem with how vapid it seemed to be becoming.
The show has the potential to look at a lot of interesting ideas but (as one review I read for season 3 said) seemed to be more interested in playing around with the aesthetics of #revolution than the idea of revolution itself. So heavier on slow-mo shots, looks of defiance from badass women and on-the-nose use of music to complement the music video aesthetic, lighter on ideas, clever plotting and believable character choices.
Maybe they turned it around in season 3 but that was definitely the direction it felt like it was drifting into in season 2. The early reviews fir S3 weren't promising enough to draw me back in though.