Does buying a game does give you the right to be CRITICAL of it?

[Kantor]

It gives you the right to praise and criticise it, to say that you disliked or even hated it.

It does not, however, give you permission to refer to the game as "Failzone" and start spamming this wonderful new word you have created everywhere. It does not give you permission to state your opinion as a fact. It does not give you permission to say that everyone who likes the game is a fanboy.

I've seen all three of these, from different people.