Now I know this isn't something unique to Brink, but it can be exceptionally annoying in these lengthy timed games to work for so long only to watch your team bail because you've stalled for a moment in view of the finish line.
On a side note, it's also sad to see that so many "winning" teams will happily keep their team stacked 5 vs. 1 (in competetion mode) for the entire length of the game, with no interest in a challenge, just to brag about the big win they get.