Finally finished Rage last night and, man, even knowing that the ending was poor couldn't save me from disappointment. The game really does just end. I cannot believe how worthless and unsatisfying the end of the game really was. The last level was actually rather cool looking too and there was a lot of potential for exploring that type of environment, but alas, after 20 minutes the game is over.
They didn't even bother to implement a boss fight of some sort.
As much as I loved most of the game, I can't deny that it felt completely unfinished. The world was nowhere near as fleshed out as it could have been, the characters went nowhere, and the story was paper thin. What was the point of introducing us to any of the characters when they delivered nothing more than a handful of missions before disappearing for good. The game also failed to deliver any motivation for fighting "the Authority". What exactly makes them so evil?
It's true that id has never traditionally delivered in these areas, but they've created a very strong world and ultimately did nothing with it. The gunplay is phenomenal and that does save the game, but it could definitely have been something more.