I don't think anything is wrong with postwork at all, but I don't know a lot of it myself so I do very little.  I also don't really care for a lot of the things that are done with postwork in an artistic sense, e.g. a heavily airbrushed or fogged look in an attempt to duplicate Luis Royo's work.  I think there are good reasons for certain aspects of postwork that I am anxious to learn - on the other hand, achieving certain things with physical paint and brushes is a real measure of skill, running a canned Photoshop filter is not.  Plus there is often no real artistic reason to do an obtrusive postwork effect, and it may take away from the image more than it adds.

Particularly in cases where you plan to re-use a character many times, like in my work (planned graphic novel), you really don't want to be postworking the same fixes every time if you can avoid it, imo it's a lot more sensible to fix as much as possible in the scene itself before rendering to avoid duplicate work.

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