Does reputation, history, and shared preferences "remove all nuance from discussion" in real life, or does it add nuance? I think it's clearly the latter.
We often hear that people should pay attention to reviewers whose taste aligns with our own. Nobody seems to disagree with that. Why then would it be unreasonable to assign a similar designation to users?
Games are too complex now to be understood by the masses. It's not 1996 anymore. As the depth and complexity grows, opinions from "outsiders" naturally diminishes in value.