Now...that I'm not sure about. There are objective bases for qualifying a game, and more than one person will tell you they recognize a game as objectively bad that they really like.
Yes and no. There are objective bases for quality portions of a game; where the opinion comes in is what matters more?
Characters or plot?
Graphics or design?
Controls or mechanics?
While you can obviously say one game controls more fluidly than another(in some instances at least), it's entirely opinion how much that matters.
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Fresh from my first justified ban. Ever!