Gameplay is all about making choices and in a poorly-balanced game, many of the choices available to the player are essentially rendered useless. And this, in a nutshell, is why game balance is so important -- it preserves your game elements from irrelevance. Keith Bergun of 100 Rogues
What is the line between an imbalance issue and lack of skill? On a philosophical level, if a player becomes frustrated with a game, does this line matter?
Simple decision: is your game balanced? What type of playtesting rigours can your game undergo to be sure?