portal 2 is a great game.
soundtrack is nice, sound design is nice as well. artstyle and visual design is beautiful and really fits with the post-apocalyptic setting, even if it's entirely underground. the puzzles aren't too challenging, but they still are satisfying to figure out. the portal mechanics are nice and feel satisfying to use. the story is great and dialogue is some of the best in any video game ever imo, and the characters feel real as well.
the coop multiplayer is fun as well, but it lacks the story and interesting dialogue of the main campaign so it's not as fun for me.
amazing game.