The Gottingen and Kaye example is a pretty good demonstration of how heritage mimicry can fail, and how little it actually matters. That building has numerous problems: bad proportions, no storefronts in a commercial area, and uninviting plinth architecture. At the other end of the block is Garden Stone Place:
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This building is not perfect either but it complements the commercial nature of the area and it fits in better with its neighbours despite the fact that it is built in a more modern style.
Ultimately I think heritage vs. modern architectural styling is largely irrelevant in terms of determining whether or not buildings look good, whether they will benefit the area they are built in, or even whether or not they will complement or clash with other buildings. Instead the real question is whether or not a building is well-designed, whatever the style.