No, I wouldn't call them dumb, and I don't mean to give you the impression that I go out and shoot my limit with a bow, either. I'm usually able to kill two or three each year, because I enjoy it, and I put in the time hunting them.
The way I hunt them is to very slowly make my way through good grouse cover, spending more time looking than walking, like I would if I was still hunting deer.
More often than not, they fly before I see them, but now and then I'll spot one standing there looking at me, or I'll notice one when it takes a step or two. I've had a few fly up into low trees and offer me a shot over the years, but it doesn't happen very often.
I'm no great hunter. I just love to hunt, I'm dedicated, and I'm able to spend enough time in the woods to make it happen once in a while.
Bob