Nier (PS3) - 8/10
Relentlessly depressing (in its story).
Takes place in a doomed world, where your every action makes things worse and snuffs out what little hope there was left, whilst you/the protagonist remain unaware until it's too late.
Gameplay-wise it's a bog-standard 3rd person action game, with RPG-lite-lite-lite elements. It's far, far too easy on the Normal difficulty. Also it is fairly grindy if you want to see everything the game has to offer (the bad kind of grindy - RND dependent grindy, like an MMO).
But you play Nier for the story, not really the gameplay.
And don't play it at all if you like happy endings.