AF Micro Adjustment is a great feature. We didn't know how much we needed until we got it.
It IS a great feature, but I don't think there is a lens problem as more than one poster has suggested. These are good lenses and in most applications, the differences we are talking about won't cover the distance from someone's nose to their eyes. SERIOUSLY! Now that we have such great pixel-peeping technology available to all of us, we use it and then think that we have been sold a poor quality lens or body. No, actually we have been sold a product that is so good that it reveals the limitations in other parts of the system. I got excellent images with my 30D. Now I can do even better with my 50D using AF Micro Adjust. The lenses I used with the 30D and now on the 50D didn't suddenly become "bad copies." There have always been variances in manufacturing, and for some very fine work, that may be a problem, but for the majority of our landscape work, we are seriously splitting hairs here.
There certainly is a good case for wanting better lens technologies, but I am afraid that the lens wars will not be as quick and easy as the megapixel wars--Moore's Law doesn't apply to optics.
Instead, how about 32 Bit per channel color? Anyone? Anyone?
<sarcastic rant is over>