Do you mean in Brink or in games in general?
Splash Damage is making it so both are viable (but ADS is recommended for more than medium range). Either way, the iron sights I've seen so far look pure badass. Another thing I realized, I'm not even mad that a lot of people are going to spray if they want. Because you can do it with most weapons. Unlike Call of Duty, where 1-3 weapons have crap like grips, and THEN have Steady Aim. In this, it's as if everyone has them.
EDIT:
I hope the hipfire isnt too accurate, it makes games feel less like a FPS to me
It probably will be. But don't let it deter you, you'll be able to aim down your sights and still take people down with ease. Remember, this isn't Call of Duty.