johnsemlak said:Balance
Hmm, I'm not so sure it's as important for the PCs of a party to be balanced, as it its for each character in the party to have a role, and a chance to shine/perform.
That's actually the definition of Balance as it applies to PCs, John.

Although the primary way of assessing the balance of PCs is in a combat situation, I think we can safely say that some classes that may seem "underpowered" are actually there for the wider game - such as the Bard.
It is just that Combat is an extremely significant part of D&D, and the area where the rules come most into play, that we return to it as the determiner of balance.
The DM obviously will cause the balance between the classes to be adjusted, but there is a central point - a design assumption, if you will - that everyone is aware of.
Cheers!