Lifted from a recent Legacy speaker ad: "Room resonances and reflections make up the majority of what reaches your ears".
IF this is TRUE then most speaker reviews, at least, would have little value considering that listening environments are so different.
So the only way a speaker review would be somewhat valid is if one possesses a very similar listening room and system. This doesn't even take into account variations in hearing acuity.
The reviewer may not be a SHILL at all, although perhaps some are, and the speaker may actually have sounded excellent under their particular circumstances. Whereas the same speaker may sound only mediocre under totally different circumstances.