A lot of people absolutely love this anime, a lot of people hate it to its core. The question is, is it good or bad, which one is it.
First of all, lets talk about the aspects everyone agrees upon. This anime has- 10/10 music, 10/10 animation, 9/10 fighting seq. Great right?? So why so many people hate it?
This anime has a unique story development. It only tells bare minimum. People often criticize the lack of back-stories of the main characters, lack of world-building materials. However, all anime should not follow the same path. This anime tells a story about the contribution of a certain organizations part in a rebellion. The organization members never had much empathy for the people or independence, or even justice. So the back-stories about the characters, the anime-style-epic-B&W-flashback scene, the relation / interaction between some characters was somewhat avoided and I think it is for the good.
Some people hate it for the deaths. I think it certainly is a fresh and bold step, far from the no-death cliche. Also it somewhat moves away from manga ending. Some people don't like anime-original endings.
This anime ventures to a place where no anime had the courage to go before. Like it, or hate it, this is a must watch for all anime fans.