So your saying team tactics to kill an enemy don't apply unless its TDM? Objective-based or not, its still a shooter (and not a twitch shooter like CoD in which the victor is determined by who sees who first), there is absolutely nothing that suggests that working as team and communicating to kill some enemies in the way won't be useful.
An operative behind enemy lines can call out enemy locations and where they are headed, a engineer could then place a machine gun nest at where the enemy is headed. Groups of teammates can designate one of their own as a distraction while the others sneak up from behind, there are still countless strategies from intelligent shooters that can apply here, and I have yet to see any reason why it wouldn't here.
Because it's an objective based game. Killing people doesn't matter in Brink. Also, quit trying to relate this to Call of Duty. Call of Duty is trash and has a learning curve steeper than Mt. Rushmore, and the fact that everybody here always bashes that game even when I'm directly using Halo as my example is annoying and frankly pisses me off. Brink still looks like it takes 5-6 shots to kill with the exact same weapons that are in CoD, so in essence it has the same play style as CoD, but with longer health bars. Say whatever you want, nothing is gonna change that.
And no, I wasn't saying the tactics don't apply unless it's TDM, you pulled that out of thin air. I was saying TDM isn't a mindless fragfest after you claimed it was. Sure, there are ways you can use basic teamwork in Brink, but nothing that's as revolutionary that would make Brink more played competitively like you claim. Whether you like it or not, Team Deathmatch is the most popular game mode in any shooter and a game that relies purely on objective based gameplay is going to alienate the majority of people who compete in clans. The closest the average person has gone to an objective based game in a clan war is Capture the Flag. And don't give me more of your bull "Call of Duty CTF doesn't even rely on having your team covering you" BECAUSE I DO NOT CARE ABOUT FREAKIN CALL OF DUTY!
And yes the customization and team/objective based stuff isn't that revolutionary, but the movement system is revolutionary, different objectives for every class is revolutionary, the body type system separate from class system... not sure if that is revolutionary but I never seen it before, the side-objectives have been done before (MAG's tactical assets, like mortar batteries, anti-airs) but its still a very nice addition because it adds depth and complexity. The class system seems very superb, even a basic class like the medic that has been done by every other class-based shooter before seems more perfected, like when you get revived you don't automatically get up until you want to so you don't have to get up right in the line of fire (saw it on youtube when researching this game).
The movement system isn't enough to sell a game, different objectives for every class has been done in SD's past games (I have Quake Wars in my living room. It's... pretty much the same thing), the body type system seems like it will probably lead to imbalance (The heavy can do everything a light cab do but wall jump, but he can equip all these super heavy weapons), the side objectives is what makes the game less teamwork oriented when the game is only 8v8, and the engineer, soldier, and Operative are far nothing out of the ordinary that you wouldn't expect.