Its simple, there is an element of subjectivity to art and entertainment that can never go away. Not only that but the real impact of art cannot be seen when it first comes out as new art is generally considered ugly because the mass market hasn't evolved to understand it yet. So often the best art is only considered the best years later.
The problem with reviews is they're too close to the hype and too soon. Not that I'm advocating that reviews don't come out right away, but truly trust worthy critical appraisal comes years later.
Thats why we now know that Starcraft is a classic whereas Quake 3 is just an important (and awesome I might add) footnote in gaming history.
Not to mention the notion that you can assign a score to entertainment and art thats universal to everyone is ludicrous.







