I have to address something that keeps coming up:
Many people think that the Overlord is OP.
Many people think that the Heroes are OP.
Many people think both factions are evenly matched.
It's roughly a 30/30/30 split.
This does not mean a game is balanced.
There are many factors inherent in the design of the game that create bad match ups. In fact, I have yet to really see a good match up in this game. In the end, the question of who these match ups favor is irrelevant to a discussion of game balance.
To my thinking, a well balanced game has as few bad match ups as possible. By this definition, given the poll data with the 30/30/30 split, Descent is not a well balanced game, as it generates bad match ups at least 60% of the time. This imbalance is worse in Descent than in some other games, because the imbalance usually shows up early in the campaign and is exacerbated with every quest.
Don't get me wrong. I love Descent. It's probably one of my favorite games, but the imbalance of the game is just something you have to accept going in if you are going to enjoy the game, just like you have to accept the chaotic randomness of Wiz-War, the fiddly-ness of Merchant of Venus, and the tendency of Arkham Horror to be a game where "the game plays you".