Nier, like others have said, is the perfect game for this topic. Despite being very original and indeed excellent is many ways, the game received a generally negative response from western critics and so many of the game successes went unrecognised. The game has now built a significant fanbase on GAF, but only long after the game was released and after positive word of mouth and sharp declines in price got people to try it out. The game is the textbook case of a cult classic; issues with budget and presentation limit its immediate appeal, and it admittedly lacks gameplay hooks that would allow a demo to make a compelling sell. What it does right (story and music perhaps the most notable) though it does so in a way I haven't seen a game do in a long time. Nier stands out to me as an experience that actually sticks with me, as opposed to the entertaining but ultimately forgettable experiences so many games end up.
All that said, these sorts of games are often divisive, as Manmademan has already shown. Some enjoy it (if they do, they generally seem to love it), others don't, as it's a game that ultimately was never created with universal appeal in mind. For that reason, it's a game that can't really be unreservedly recommended, but it certainly didn't deserve to be as universally panned as it was.
All that said, these sorts of games are often divisive, as Manmademan has already shown. Some enjoy it (if they do, they generally seem to love it), others don't, as it's a game that ultimately was never created with universal appeal in mind. For that reason, it's a game that can't really be unreservedly recommended, but it certainly didn't deserve to be as universally panned as it was.