Tl;dr: A fun FPS that brings something new into the market. If you're into Character Customization, be warned that there aren't female characters.
Brink is a fun game overall. Gameplay is nice, teams are balanced, and nobody goes home a loser. The fighting is relatively simple. Aim, shoot, kill. But then you factor in ammo resupplies, damage buffs, and armor enhancement, and it complicates the equation. Complicate meaning "funnifies" in this usage. Plus, the movement is unique. Holding sprint activates a kind of "dynamic parkour" feature that allows you to find new paths and move around more fluidly. This also allows for some characters to vault walls taller than them. Class perks and abilities are cool, being able to give someone a damage buff or resupply of ammo. There is also a cool perk system, which as you level up allows for more abilities and tricks to be available to the character. Instead of set perks, they are bought by level coins, a nice feature in my opinion.
The story is engaging, albeit short. Depending on which side you play, you get both sides of the story. You can replay any mission as either side and learn their views and reason for fighting. Alongside the main campaign (which can be played solo or multiplayer), there is freeplay and challenges. Freeplay is exactly what it sounds like. Challenges are different tasks that test your ability to use the ingame skillset. The only qualm I have is with 'Parkour This'; I love the parkour aspect of the fighting, but in no way did I ask for you to require me to master it to unlock silencers.
I love the character customization. Very simple, clean, and creative. Two things: No girls, and no custom facial/bodily features. I find the lack of girls sad (if you emphasize character customization, you dang better have both genders!) but not game ruining. Yeah, it'd be nice to seduce my enemies into not shooting me, but it's okay to have only guys. The only thing that really grinds my gears is that you are locked to a specific set of facial setups. No big pouty lips and anime eyes here, just a couple dozen near identical faces. On the bright side, each clothing piece comes in an assortment of colors (which often change the patterns of the clothes as well). The face paint and tattoos partially fulfill me in the way of face modification. Overall it's nice, but still makes the character customization just feel like chara custo.
One aspect this game displays nicely in gun modification. You can attach multiple enhancements to your gun. That's it. You get a few sights, a couple muzzle brakes (purely cosmetic, still fun), and if you try hard enough, silencers and speed holsters/slings. No camos, nor extreme performance enhancements (which adds to the argument of team balance).
Overall I give it an 8.5/10, really fun to play, but has a couple bugs and missing features that kind of harm the gameplay. If you have the money, it's worth it.
8.5/10, would knockdown again.
(Btw, the reason I complain about Brink not having girls while CoD and Battlefield don't is that advertising character customization implies having women; and I don't think that CoD or Battlefield said that there was a totall of 100+ quadrillion total combinations.)