Crosshairs and ironsights

If anyones played Brothers in Arms, there was no standard crosshair for weaponry, you could fire from the hip, but you were damned inaccurate at ranges +10 meters.

You could however go into ironsight mode, sighting down the sights of the gun, this took a half second or so to bring up, then a second or so to get your bearings and aim.

This in my opinion was a lot more realistic and skillful than the standard crosshair in most FPSs, and Id love to have no crosshair but ironsights (or whatever targetting system is used for the weapon).

What do you think?