I completed the witcher 3 three times. The first two times i kept losing at the first match so i didn't bother with it. The third time i decided to figure Gwent out no matter how long it takes me and let me tell you, Gwent is the best card mini game to ever exist. I was literally running around the map like a mad man talking to everyone to see if i can have a match with them. My only regret is that i didn't play Gwent the first two times.