I disagree, when my opponent starts to get frustrated (losing composure) the game starts turning worse and worse with each consecutive mistake/bad roll. The game atmosphere turns sour when my opponent stops having fun with the game. Half of the fun of warhammer is to enjoy the other persons company; otherwise, if I didn't care about the other player what so ever, I'd just battle against myself to save my opponent the frustration... This is what makes players that are great sportsmen a joy to play against because, regardless of the battle's outcome, both players have had a great time. Nobody likes sour grapes, end of story.
However; I do agree with part of your statement, the lore of heavens is a great lore along with the rest in the BRB.