Yes it is!!!

Not only did you miss out on gaming session but you get no XP as well. You'll watch your friends discuss how awesome last session was and how the barbarian split the evil villains head in two and your friends are laughing from all the fun stuff that happened. You kinda feel left out and try to get into the conversation by mentioning that spell you cast that saved the group....but it's old news and Tim looks at you and says "yea but that was three sessions ago". To top this you get no xp and now you are a level behind, all because mom forced you to clean the basement instead of playing. As you stand there talking with your buddies, you'll be crying inside yourself.