Not necessarily. Plenty of reviews have long play hours but are very negative. Paradox games are probably a good example of this - a niche game that attracts a very specific player who might not agree with all design decisions but because his genre doesn’t see much action he plays the game anyway.
I think a simple toggle to only show reviews by people who currently own the game would be a pretty useful tool, from my point of view certainly more than a histogram that would make me scour the forums for information on events that might have caused those spikes.