The rating system isnt flawed. Its the people using the system.
If I ask you what you thought of the restaurant you just ate in and you reply "Horrible I puked twice between courses. 9/10" then you don't know how to rate things.
The rating system and the people using the system are flawed. Basing your initial impression of something on someone else's opinion is a flawed way of thinking. Use your own damn senses to figure out whether you like something or not, you lazy bastard.
Video game reviews are especially flawed as a whole. Everyone finds games enjoyable in different ways, and expecting a review to tell you how you're going to enjoy it is moronic. The only thing worthwhile about reviews is if they tell you real problems with the game in question (glitchy mess, shitty localization, etc). Don't even get me started on the numbering system used by various outlets to review media...
IGN, you expect me to follow your review like it's the word of God, even knowing that you were probably paid off by the publisher? Ok.
Also, reviewing an MMO is tricky business. MMOs are always changing.