When I hear about a new game, I usually read the first sentence or two on Wikipedia. I rule out games described as certain genres or types, like soulslike or online-only multiplayer games. Then, I check reviews on a site like Metacritic. If the critic or user reviews (doesn’t need to be both) are good enough, I add it to a list to play.
I also do this with movies and tv. Obviously, with sequels/series I know a little bit more about the games/movies/shows but I still go in as blind as possible.
From the title, I thought OP would just look at a cover and buy the game, ignoring reviews. This is not the case, there’s some research on the (perceived) quality of the game, so I wouldn’t consider this unpopular.