I think Brink is really summed up as more fun than good. I can seriously write pages on everything thats wrong with it but I can't stop playing/thinking about it.
On a related note, remember the discussion about what the best iphone/ipad/facebook compliments to boxed games? How great would an app be for doing your character/gun customizations for brink be? I know I dump way too much time when I boot it up futzing with all my new unlocks.