I recently bought what I feel is a perfect hunting rifle and one of the reasons I like it so much is because it has iron sights. It's a 30-06 Husqvarna and weighs 6 lbs. It shoulders like it was made to fit. I shot my first animal with it at 85 yards. I spotted it at about 300 yards but that was outside my ability with the sights so I worked to get closer and ended well.
But, that has be thinking should I have a scoped rifle?
That's entirely up to you and your eyesight. My eyes suck, so I feel I need to use a scope to reliably make clean shots. I owe it to the animal to do so..