I concur OP! Brink's only been out a couple weeks and I've already made as many, if not more friends than I have in my entire time playing other games previously. Heck, if I join a friend's fireteam and they have friends in there, and we get along, more friends!
I'd disagree with that, the only thing a game like from the BF or BC series has over Brink is larger maps and vehicles, really. Brink has more for classes to do, better weapon personalisation, better graphics on PS3, more to do every match, relatively-well balanced weapons and skills, and minus the elitist over-competitive KDR-waving [censored] bag minority that was somewhat present. And recent CoD has [censored]-all depth at all, all it consists of is the exact same 5-minute game a thousand times over with cheap tactics, exploiting anything over-powered, and a terrible community, just with different maps and guns each game around. But it's still obscenely thriving. They also both have boring campaigns.
It's because Brink is so different that it's not doing so well, standing up to IPs that dominate the market by a mile was a risky thing from day 1.
Well, lets pick BC2 as an example since you said BC, and BC2 is the only one of the two I've played. It has twice as many weapons as BRINK, not as much weapon customization though (thought BRINK's weapons are all more or less like each other), so that's valid. Classes in BC2 are much more specific and have more to do than in BRINK by a huge margin, so you completely missed the boat on that one. The weapon system in BC2 has a much higher skill ceiling than BRINK's (The more skilled you are, the more you can get out of a weapon, rather then learning them early on, and then remain bottle-necked by them, since you've already mastered them and all their nuances.). BC2 maps allow for much more diverse play than BRINK easily, the destructible terrain and buildings offers incredible gameplay, while the size and terrain offer a huge amount of play options, easily dwarfing corridor based play like BRINK has. The BC2 point system is better balanced and more complex than BRINK's. BC2 was like no FPS I've ever played before (it was a first in the FPS PC market, nobody knew about it, or it's new style of gameplay.), BRINK feels like a poorly actualized knock off of TF2 and Dystopia (Dystopia is not a console game, so that explains why you are clueless about it.) among others. Also, game's like Section 8, TF2 (Yes, despite being a sequel), Dystopia, Savage, Tribes, Counter-Strike, Natural Selection, etc (I could go on), were all hugely unique games that resembled nothing before them and were successes that quickly garnered large and dedicated player bases. All in all, I don't think you realize how diverse BC2 is, unfortunately, or just the FPS market in general for that matter.
Man I'm sorry, but you are basically wrong on every possible front. While BRINK is a good game, it's simply not great like other titles, regardless of whether you like those titles or not. The FPS genre is diverse, and once you gain experience in all it's facets, you'll realize how BRINK failed.
CoD, while having small maps, fast respawns, and basically pandemonium gameplay, has a weapon system that still requires skill, it's actually offers a lot more learning room then BRINK's, which has weapons that generally are inaccurate and simply deteriorate in effectiveness after a few shots (the spread is massive). I don't know, I'm not used to talking to console players. Maybe it's because you are a console player this is all not obvious to you?