Game is little boring at the start, but if you will somehow go through few hours of it, the story will hook you up, at least it was the case for me. Also +1 for very well made art style. There are some ways you can build your own army. Some fights even forces you to build specialized deck to beat the encounter. I must say, some puzzles were very clever, but in the end the game wasn't very hard (I played on highest difficulty). The only complain I have is performance in some Nilfgaard fights. The code for AI is not optimized at all, and the time it takes AI to calculate it's move is attricious sometimes. Very surprised that CD Projekt Red let it in this state. Very unprofessional.
