There are plenty of reasons why someone's account might rack up hours in a game they don't particularly enjoy.
Being driven by a completionist streak, letting someone else play on their machine, needing a distraction from an unhappy life, supporting a friend who wants to play together, being bored of all their other games, leaving the game at a menu screen while they're doing other things... the possibilities are endless.
I won't discount a review for having a high hours count, but I might for being especially rude.