I don't know how some people manage to stay positive without a sight. Any time I take off my Reflex, my k/d turns to ****. I actually routinely lose close range duels to AR and Sniper users w/o a sight.
I USED to. I used to need the RDS on pretty much everything.
I've gotten pretty used to hip firing now though, so it's not really as much of an issue. The times I do need to aim down sights are usually when I'm going for long range kills, and then the iron sights are GENERALLY good enough.