EDIT: Most of the above information relates to the "Campaign" in the menu bar. However, you can play a series of "missions" from the campaign with and against real players. In some ways this is even more disappointing news. You guys do realize that when they say "we are seamlessly blending single player and multiplayer" it just means that they are the exact same thing! The multiplayer modes are just parts of the campaign in which instead of playing against bots you play against real people. http://www.vg247.com/2009/06/12/splash-damage-talks-brink-single-and-multiplayer-modes/
THIS GAME JUST WENT FROM INNOVATIVE TO GARBAGE.
I think you may be misunderstanding, try not to think of this as like playing a cod multiplayer map in campaign with a small cutscene at the start saying 'Were stuck at this Array, lucky for us soldier theres a flag over there, if we cap that 3 times we may just survive this', then playing against another team of humans.
They have blurred the line, when I first heard it and read into it a bit, the only comparison I could think of was back in the day when I played tfc, maps like avanti and dustbowl (I think those were the names, I was 11 at the time) had progressive stages to them each with a different objective. Even then that comparison doesnt do brink justice. From what I gather, of course I could be wrong, they have created two full story lines, running parallel to each other, each stage in this story takes the form of a non symmetrical non arena style map, where each side has conflicting objectives. You can play this alone against bots, although im guessing the game is definitely meant to be played against real people as opposed to bots, or you can take on real people. This means it will be competitive yet have a story line for those who are interested.
True if you are after another game with the standard ctf, deathmatch, koth modes then you probably will be dissapointed (I dont know this as fact there may be an option to play a custom deathmatch game on a map of your choice), but there are plenty of those games out there. Granted they dont have SMART or the same kind of gameplay, physics etc etc as brink. Splash damage are just trying to be creative here and break away from the standard type of shooter. I personally think it sounds and looks great, I cannot wait to get my hands on this game, and I come from a competitive gaming background.