The game was showered with praise and GOTY awards when it came out but I never see it on any "favorite games" lists and shit. Like, you'd expect a game that aged extremely well, especially when compared to other games of its generation, to at least be mentioned from time to time but nothing.
I loved it. Coop mode was amazing, but also you need a friend to play with you and if you play it too much you'd learn the puzzles. The discovery and problem solving goes away. It's not the type of game you return to again and again.