What in your opinion, makes a game good?

I think a good game shouldn't be too easy or too hard.I don't care about graphics but for the people who do care I would make a game with good graphics.All you really have to say when asked what makes a good game good is make it fun.If it is an RPG you need a fun battle system so people don't get bored from all the random battles.Or if it is a fighting game combos make it fun.