Eh... There's something that's been bugging me about these gameplay trailers.
The reason they look really cool is because there heavily scripted,
and whenever I imagine myself playing the level I'm watching, I can't help but find it boring.
For example, the trailer implies that there is a sequence where you work with another soldier to set up, load, and fire a portable mortor. Barring a mini-game that would break the photo-realism, this will probably be done entirely in cut-scene, with maybe a couple button presses to trigger them. Before that, you're just running down a hill, and while this could be a sequence where you have to dodge enemy fire, it's more likely you'll just be pressing the left stick forward for a minute.
There's a similar moment in the fault line trailer when, after disarming a bomb, you're ambushed by an enemy and fight him of with hand to hand combat; since we all know the only melee input comes from a single button, this sequence will have to either be a quick time event or a cut-scene.
I see this happen a lot in new shooters, where the developers want to put in a sequence that does not fit their control scheme, and decides to solve the problem by minimizing player input during that sequence. And as many site contributors have brought up before, minimizing player input is the last thing you want to do in a game.
So, yah, I'm going on record as saying the BF3 campaign will be a letdown to many. I still pre-ordered the game, but did it for the multiplayer. Incidentally, I feel the depth of experience possible in games like Battlefield proves that devs should be able to make compelling, realistic experiences with-out leaving their shooting control scheme, thus eliminating these half-assed interludes into melee, battlefield mechanics and what have-you.