Until Portal, nobody really gave a shit about puzzle games. Gabe Newell said so himself, puzzle games would sell barely any copies on steam. Then portal 1/2 comes along selling millions upon millions of copies appealing to people of all ages and both sex's with dozens of inspired games since.
Is this a more relevant game than Last Of Us? What has Last Of Us contributed or what quality makes it as relevant in the long term as a title such as the Portal series?
According to some, Last Of Us is a landmark game. It seems Portal is relevant for it's contribution towards puzzle games.