I don't care much for "realism" in games. (Besides how can anything featuring magic and mythical beasts be considered "realistic"?) I tend to favor games games with a mythical atmosphere where one legendary hero can take on hordes of lesser minions. How ever I do tend to favor some degree of "believability" and internal consistency. That is to say, while many things in the game are inherently unrealistic, they make sense in terms of genre and from the point of view of the campaign world. For example whereas the heroes and adventures of Tolkiens Lord or the Rings are epic and larger than life, the world has a lot of detail and internal consistency. Whereas many fantasy campaigns seems very contrived and inconsistent.