I just finished second playthrough, this time in English making different decisions, so here are some chaotic thoughts. Even basically knowing what to expect, personal experience was still pretty brutal
And I can't even say that this Geralt and his decisions were muhaha evil, just different, presenting moral dilemmas even in small quests. I felt the only time there were no doubts what to do when deciding Jr. fate.
On the first playthrough I mostly followed the story, used fast travel a lot and missed a lot of side content, for example: Geralt ran along the road in Velen on some business and a peasant asked him to track his horse.
And this is just a tiny sidequest you can easily miss.
These choices were something I felt were lacking in DAI. I remember finding a letter about two brothers, a templar and a mage. So here I was preparing to find and to support one of them or maybe to reconcile them even, right? Haha. You know how that went. I love reading codex about ancient history or Thedas nations but this, no. I want to participate in events that happen around me, not to read about them. And even when there are actual quests your only choice is to just accept it or to decline.
I still don't like english Geralt

Even during the wedding in HoS Vlodimir sounded the same unemotional monotone, and it did not suite this character at all, in my opinion. But other NPC were great, especially Ciri and Yennefer.
I'm going to wait for Blood and Wine and then to play in polish to keep thing fresh and to get complete experience.

After reading Asunder and Masked Empire I was actually disappointed to meet Celine etc in the game (did not live to expectations) and surprised so many people in Thedas write notes, letters and diaries when in Asunder it was said that most commoners are illiterate.