Yes, there are things I wish they would have done differently. For example, the average casual gamer, I'm sure, has no idea what different match settings are. In fact, I'm sure the average casual gamer playing BRINK right now has no idea he/she can play the game online WITHOUT bots. Also, with such a strong emphasis on teamwork and a strong stance AGAINST lone wolves, they made it difficult to play with a clan or a group of friends. Those are a couple of things from a long list of things that SD could have done differently (or CAN do differently if there were to be a sequel).
However, I applaud SD for releasing a different game than what we've seen this past few years. With COD as the reigning FPS king (as for as popularity goes), many developers have done their best to make their game more like FPS. Even DICE has made Medal of Honor similar to COD, and even Bad Company 2 felt like it tried to appeal to the COD masses. Homefront also felt like a mix between BF and COD.
I know that shooters are shooters and that gameplay will be similar among all shooters, but you have to admit that these recent shooters seem to be almost copying the popular COD and BF series.
TLDR version 2: While SD didn't do anything new, they definitely did something DIFFERENT. They showed with BRINK that things can be done differently and people will generally like it. Other developers should take note and say "enough is ENOUGH!" No more COD-esque games, no more trying to TOPPLE COD. Be something that developers haven't been in a while -- CREATIVE! INNOVATIVE! And while Brink ITSELF isn't exactly revolutionary, it should be seen as a START of a revolution.