Balance can mean a lot of different things to a lot of different folks. I can say the surveys weren't helpful from my perspective as a tool to highlight balance issues largely because they ignore a few points:
(Full disclaimer: I've always looked at classes as packages of grouped aspects, not a particular role. So this may very well not make sense to folks that insist on the notion of one class = one and only one role. example case: Fighter with hefty feat count vs paladin with fewer feats but innate spellcasting vs barb with barred spellcasting capacity.)
1) Does a given class have an aspect that when focused on make it shine in that area?
2) Is that situation common enough to warrant focusing on it for the entire amount of time it takes to roll up, level, and gear a character?
3) Is an aspect of a given class equivalent, inferior, or superior to that of a similar class with the same aspect?
4) Of the aspects shared across classes, do they synergize, and if so, are the costs of doing so commensurate with the benefits?
5) Of the aspects shared across classes which do not synergize, are the rewards for focusing on that aspect commensurate with the opportunity cost of forgoing other benefits?
6) How sensitive is a given aspect to dungeon numeric inflation (be that mob count, HPs, or mob/trap DCs).