How do! Another question intended to be open, which no doubt by the time I'm finished typing this up will appear to be weighted!
But, anyway. Balance. Balance balance balance. Is this something genuinely achievable? Is it an objective, or subjective matter? Is it both? Is it doomed to forever be a kind of compromise?
So for my take...in terms of GW games, it is improving. Well, it's rapidly improving in Fantasy at least. The first 5 army books are much of a muchness in terms of overall power. The new rulebook has also managed to even things out to a noticble degree with the older books.
But I don't think we will ever see absolute balance. Every army has it's own play perks, and as such, is likely to have it's nemesis army it will have a harder time against (for instance, my Ogres have to work harder against Skaven). But I don't see this as being a problem big enough to make the game unplayable.
So, for you?