Being a huge fan of the original work, (I own all currently available volumes) I was very disappointed with Season 1. Shuumatsu no Valkyrie had the potential to be the hypest fighting manga of the current decade, but Netflix just chose to fumble the bag: amazing character designs, great fighting secuencies, enjoyable and quick-to-read backstories... if well adapted, SnV could have easily become one of the best fighting anime ever made. But Netflix just didn't want to.
However, with Season 2, they managed to offer an actually decent product. It still has evident flaws, yes, and that's why not everyone will enjoy it- but there were some pretty good moments, something the first season lacked, and besides the animation (which wasn't that bad this time), everything else is actually pretty good.
Overall, this season is a lot better than the first one, but I still deeply recommend reading the manga instead. It's just better in every aspect.