It IS subjective. For a game of its kind it can have sold realy well yet not have sold enough to make up for a poor management and way too big of a debt. It wouldn't change the reality of "it sold well" but still validate "it didn't sell well enough"

4,000 reviews suggests sales numbers of 400,000, which is huge.

They sent out a notification that development had stopped, but they were still selling the game for half price. This resulted in huge review bombing.

Even 40 000 sales is still decent for an indie game?