Obviously, there’s a lot that goes into what sets a game apart as a masterful work of genius or a horrible failure. For most, though, a game can be flawed or lacking in certain areas and still be enjoyable, as long as it meets a few key requirements. So what do you look for most in a game? What is the most important thing that must be done well for you to tolerate the shortcomings?
Feel free to go into more detail in the comments.