None of the people who I knew played Brink still do. To be honest they stopped after a month because of the scarcity of people online.
Looking back... I never really got this game to be honest... when I watched people spawning and buffing everyone else who spawned next to them for no apparently obvious reason, it seemed RuneScape-esque in the horribly fabricated way it simply rewarded doing the action, regardless of context, difficulty or personal skill level. And I've never played CoD so that rules the "CoD fanboy hates anything except CoD" argument out. There might be a place in the market for what Brink tried to do but it needs to be much more tactical to promote situational use rather than, "You're over 50ft from any enemy 'coz you've just spawned next to me... Have a weapon buff!!!" The game was anything but subtle in this aspect.
Then again, most of the people I know who bought this would buy a black bag full of garbage if it had a sign labelled "RPG" on it, so it's perhaps understandable why they found that appealing.
I hope you're talking about bots rather than people. Unless they exp whoring which even then is one of the worst ways to do it. The actual gameplay is quite different than any other FPS I've seen so far, the SMART movement system being the huge difference. You can find videos of it if you're really interested rather than my horrible butchery of describing it beyond it's something like parkour.
It's not an RPG, it's a FPS as stated above. There is some storyline behind it rather than (Oh God another alien/terrorist invasion/attack on <insert random generic locations of urban/wilderness>. At the same time though, the story is more background to actual gameplay.