It's just a bad measure. Lots of Vintage figures were not accurate. So saying that a character hasn't been remade because none match the details of the Vintage version is silly. I think you need to judge based on whether the movie character has been redone. Clearly Greedo (as well as the trooper in the Death Squad Commander photo) have been redone.
You have to look at the source of the inaccuracy, though - the R2 figure, while looking a bit funky by modern standards, is obviously produced based on what R2 looks like. Greedo very obviously does NOT look like the vintage figure outside of his head and hands, and, as Scott pointed out, the body is a sculpt based on an entirely different character. Then there's issues like the DSC, which are likely based on discolored or inaccurate/ambiguous photography. I wouldn't lump R2 into those issues - that's more an issue of a cheaper/less detailed sculpt than anything else.