Season 1 was a pretty good adaptation.

Season 2 was good enough for the first part , but unfortunately it's focusing only on the action ,not on story details... Furthermore the battles are getting too intense and with many enemies on the battlefield , the animation and drawing quality is subparts ... Better to end the anime adaptation in season 2 , people can read the Manwha to understand the downgrade and with the huge battles with thousands soldiers and giants coming , the overall quality will be a complete disaster ... I can read the whole story in one afternoon but for the animation , 3 episodes was the most I could watch consecutively.