Personally that is part of why i like the game so far. It was probably an initial design choice to make the guns less powerful to encourage more aggressive play. If you stumble across someone who is tactical loitering it gives you a slightly better chance of getting away or actually having time to try and retaliate.
People are probably just going from the shock of MW2 were it typically only takes 2 bullets to kill someone. I already have MW2 and have played it for 8 days now. I like the change of pace in BBC2 and if the devs start working to make it more like the competition ill be seriously pissed. Why not just go ahead and add killstreaks while youre at it?
This might all be BS anyway as i am pretty sure that i read a tweet in an article that said that DICE had just produced the final master disk for production. It would be pretty odd to patch in a 25% increase after a game has been out for a week or more...
Edit: plus i think that lower ttks across the board would really need the addition of Flash/stun/smoke grenades