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1) positive
2) RPG, strategy games (various, even economic ones), among the other genres, there are some decent representatives, but there are fewer of them, and accordingly, I play them less. (or maybe the opposite)
3) Well, some can be partially compared to a movie or a book, but there are few of them. People have already written everything before me.
4) Atmosphere, soul, which you need to feel, and something that would hook you and arouse interest. In each game, this is something of its own, and it is this that captivates, and not the graphics, sound, world, plot, or gameplay. The game itself can arouse interest, perhaps due to its wholeness. Hmm, maybe we can talk about specific games and try to highlight the details that attract the most.
5) The word MASTERPIECE is too loud; I don't even know which game to call that. In Tactics and Arcanum, the atmosphere is very chic, but they don't quite measure up in other parameters, especially the first one. BG2 may not be as atmospheric, but the way the world is built, all these dialogues with companions, and other features... how can you not like it? I also like NWN. And Dungeon Keeper and the game about the underground kingdom? That's a unique game. Kings' Ransom with its journey through the vastness of space and funny text-based quests. Various strategies, starting with colonization and ending with Total War. You can also remember Guild 2 and the first part of Europa 1400 (or something like that), also a good and interesting game.