While I can see why some people like a single pin sight I prefer a multi pin one. For open country I would say sure go with it. But for me, I hunt mostly in heavy timber from tree stands. I range different objects all around my stand and should a "target" come into view they usually don't stick around long. They could be at 20, 30 or even 40 yards and I don't have time to adjust my sight to the correct range. And too, not saying that I would shoot at an animal that far, but I practice out to 70 yards.
The multi pin sights do not obstruct my vision enough to worry about it and if I have to shoot through a small opening I don't want to have to guesstimate my hold over/under. I can be more accurate with a multi pin sight.
I guess both sights have their pros and cons.