A “good” game changes in certain aspects depending on the type of person playing, however there are usually consistent aspects that make a game objectively good. Personally I find games that are more chance based to be more fun, and therefore “good”, mainly because I suck at strategy games. However, someone whos strategic probably hates chance based games and dont think they are good at all.
For the vast majority of games, an enticing metaphor usually leads to a good game. Having a story, reason, and world that is created out of the game is one of the primary components that I think about when judging a game. A good game also has easy to understand rules. This means that no matter how simple or complex the game is, the rules are easy to follow, making the transition from learning to playing smooth. Overall there are subjective and objective guidelines on what makes a good game, but I’m sure as I continue to play more these might even change.