Everyone has different needs and expectations.
I decided to do some testing yesterday. I found some smooth, new roadway, turned off the A/C, and turned off the stereo. 0 to 85 mph. (Haven't tried taping the mirror hole yet.) Yes, the wind noise increased as the car went faster.... (Darn physics!)
At the same time, what noise I heard did not bother me at all. Could it be quieter? I suppose so. Is it high on my "needs list"? No. For others, it might be. Test drive it at all speeds before you buy.
To me, the car is so quiet, it doesn't take much sound to stand out. In this case, any amount of wind noise is noticeable. For me, especially with the A/C blowing and the stereo on, it's a non factor.