A few good 1000-kill rounds of team deathmatch later ...
The problem with the game is the lack of punch in the regular weapons. It all devolves into grenades and carbine secondaries, because that's what produces quick results, even if erratic. Otherwise, in any short to mid-range encounter between decently capable players, sometimes one wins, sometimes the other. There is no reason or rhyme to it. It takes so long to kill a healthy opponent that it doesn't even matter how smart or dumb you choose to approach. The encounter will in any case take long enough that players don't lose much, relatively speaking, by having to turn around first. Or they can just sprint the hell away.
Standard weapons only start to drop people reliably when you start doing squad combat. Of course half of your squad will go down too, when facing even opposition, but it doesn't matter because it all takes so long that in the meantime new spawns will come over to refill the ranks on both sides. Killing one, two or three enemies in a row in direct confrontation is sometimes possible, but then you'll have certainty that the next random passerby will take advantage of your by now nearly depleted health and it'll be over. It's all just so ... predictable.
I think getting melee down pat is a good challenge, and so is effective use of grenades at longer ranges (preferably in the faces of stationary snipers). There are also some good opportunities for snipers, if only because the maps are so enormously large. But in between, shooting people in the face personally, instigating that good old honest mayhem on the streets just doesn't feel as rewarding as it should.
*gets toasted by an air-fuel grenade*
Also, just to annoy jstevenson again: 1)two-weapon systems are horsedung; 2)having unlimited explicit sprint and ironsight aiming in one game is redundant, which makes it a design mistake.