Defiance, you could probably use a bit more gun. The designers certainly thought so. As often as not, higher-rated weapons just weren't worth upgrading to compared to your older weapons with lower ratings. But that's not true with the next major patch. Your EGO rating will be a lot more important than it was, and that means that higher-rating guns are going to become a lot more powerful and a lot more rewarding to use... which has some larger effects on the game as a whole.
For starters, in order to compensate for bigger guns, there need to be larger enemies about that won't just dissolve into a red mist when you fire your gun. Players who still want to be able to get out and enjoy the world will also need some means of doing so, which is achieved by a dynamic scaling system which ensures that even lower-rated players can still take part in big stuff. For more details on the numbers and specifics, check out the latest development update at the official site.