There are two sides of Nash's work. One is the actual math, which can be evaluated without considering the credibility of the author. The other is Nash's attemp

There are two sides of Nash's work. One is the actual math, which can be evaluated without considering the credibility of the author. The other is Nash's attempt to use it to describe the real world, which necessarily involves assumptions and simplifications. This second side is where the obvious problems are. Game theory remains popular because people can easily take the underlying math and apply it with their own assumptions. Of course, if you make too many simplifications you risk achieving a near-useless comic-book view of reality (literally, as in the blog post here).