The Witcher 3 is to me the best role playing game ever made, most of its flaws are minimal and can be easily ignored because it still delivers an amazing experience, playing the Witcher 2 first is a must for this game, and the dlcs deliver the best quests in the games since they don't need to be very long, the only bad thing I can say about this game is that most of the white markers side content is repetitive and not interesting to play trough, I do not recommend doing all of them as it's just grindy and added in to increase playtime.
Tldr: Amazing game excellent story and fun gameplay, some boring side content not worth doing.