They do really - you can pretty easily infer what category a game will fit in. A sandbox will always be touting player freedom, choices and talking about stuff you can do that effects the world.

MMCOAGs will always be talking about the gfx, content, and things the developers have set up for you to do.

PAAG games will always be talking about their combat system/etc

Its pretty easy to tell that Warhammer and AoC will be MMCOAG, Darkfall is a Sandbox and GW2 will likely be a PLAAG.