Is funny, cos in the games industry the concept is that the average end users are completely willing to learn a completely new UI for each and every game, as long as it is fun.
You can't have a consistent button layout across all games though, as there is far too wide a variety of different functions to be mapped to.
Also, by having the attitude that the user is willing to invest time learning how to use the game, there is far more experimentation in interface styles being done.