Steam introduced curators which allows you to see special reviews or tag-lines/scores from the curator for specific games; but it seems to not be doing as well as just looking at the product's general score/rating (ie. Mixed vs Positive vs Overwhelmingly Positive). Even so you still need to search for (or randomly stumble upon) the game.
Youtube videos are exactly the same thing except the youtuber has gone out to find the best (or worst) game (or which were recommended by enough of their viewers). On the positive side your game can now be seen by 1k-1m people in one video, some n% of which will buy it. On the negative side if your game is too linear, then that percentage might be quite a lot lower (all the way down to negative sales, where people who would have bought it will now skip it, because they feel they've experienced enough of it).
But at the very least it's offering a new medium for discovery for smaller teams, with a very low buy-in cost/effort.