Brink would have been great if the movement was smoother, the weapons did more damage, and the game didn't lag. The objectives, classes, maps, M.A.R.T. (no 'S'), and customization all seemed pretty good. Unfortunately clunky movement, low bullet damage, and lag is a miserable combination in any game.
The lag is something they are working and, as I understand it, there should be an improvement sometime during the week through a patch.
Personally I think the movement is very smooth, but it is a bit of a learning curve. I have found that with a bit of practice the movement can become surprisingly smooth. I play a lot with a light body type and am getting better at hopping over obstacles without loosing any speed. It's great fun to try and master specific jumps so they become super smooth.
As for the bullet damage. That was an intentional choice by the developers. I don't know if I like it either. I have always preferred the amount of damage in Bad Company 2, although some weapons were a little over the top. In this game I find that it does make a bigger difference if shots are placed well. Sometimes I can empty an entire clip on a heavy and do very little damage, while at other times I get the same heavy with only a few well placed bullets.