BRINK had some serious balance issues at launch that they didn't address even slightly until a patch almost a month later, and by then most of the players were already gone. Map design was also just terrible for disorganized public casual play and most games involved the attackers getting stonewalled and massacred at the first choke point until the time ran out.

Dirty Bomb was better but still had similar issues like that cloaking ninja guy being outrageously overpowered and just ruining every match he was in for at least a full week (I played him when he released because his probably-unintentional AOE instakill sword was his own best counter).

It's tragic because the movement and guns and abilities feel great and when it does all come together and your team is communicating and working together it's a lot of fun but in casual play it just so rarely works out.