Though RAGE was not as well received as it should have been, there is no denying that the game running at a silky smooth 60fps is a very impressive feat, something that is backed up by Carmack.
Carmack says that developers who cannot maintain a consistent 60fps on their games should keep the game at 30fps, which honestly doesn’t make as big a difference as one would think, so long as the expected speed of the game is retailored to fit the lower framerate. 60fps, even on a console as powerful as the PS3 or 360 is very difficult to achieve. Many games run at approximately 60fps or 30fps depending on how intensive they are with the resources and graphics.
A stable 30 or 60FPS is very important in games that need a high degree of skill or timing in order to complete. Fluctuations because of poor code, high amounts of effects, or background programs can completely throw off your timing, resulting in an unfair death. In reviews, poor framerate in a game can quickly result in a very poor rating,which is an example of how important it is.