I really dislike the "go to Youtube" arguments. That is dismissing the whole point of being a gamer. The point of playing a game is the interaction. Furthermore, in an MMORPG, that interaction is extended to other players and NPCs. Would you want to be invited to a friends house to just watch Metal Gear Solid, Call of Duty, or any other game you enjoy? Hell no, you want to play that game and be a part of the events that unfold.

I can watch trailers and gameplay of said shooter/rpg/platform games all day and it does nothing for me unless I'm the one behind the controller/keyboard.