The one I'm wearing now is a full-face Shoei that I bought a few months ago. I like the helmet a lot. It fits good and is good quality. I have a two Biltwells, one Bell and a Nolan. All full-face helmets and all are noisy. Honestly, I haven't tried any of them without the visor, until today. I used to wear an open-faced helmet without earplugs and don't remember the wind noise being too severe, but that was several years ago.
I have been using "foamies", but I have small ear canals and the foamies swell up too much. I have a jar full of them. After about an hour they start getting really uncomfortable. I tried some silicon style earlplugs that have these small noise reduction insert thingies that I got from Revzilla, and initially I thought they worked OK, but I was kidding myself. I bought a simliar, "better" set that had a small size that I got from Amazon called "Earpeace", but they didn't really work either. I left them a bad review on Amazon and they refunded my money. I can see these type of earplugs being good for rock concerts or as a spectator at a motorsports race track. They aren't good for wind noise, as they advertise them for.
When I left the house today I used some smaller sized foamies that I got from Amazon called "Mack’s Slim Fit". They are smaller and more comfortable than the standard foamies. I've had the best results with these. I've used them on several rides so far. On the way home I tried the silicon Earpeace ones out of curiosity, without the visor, but the Mack's are better.
I didn't really have a problem with wind noise until I got the Scout and started trying to find a fairing/windshield for it. Actually that's not entirely true. I did have a wind noise problem on my Harley Road King. That windshield was horrible. I have some tinnitus in my right ear. Probably from years of loud rock music, powertools, loud motorcycle exhaust and wind noise. The worst wind noise was generated by the small Dart flyscreen I bought for the Scout. It shoved the wind right up inside the helmet and it was extra painfully loud.
I like the fairing I have now. It keeps the wind off my torso, and I don't get fatigued by trying to constantly hang onto the bike, but it is throwing wind right on the lower part of my helmets. Seems like the visor becomes a loud speaker an inch from my face playing a constant low frequency WOOOOOOSH at 60 mph and above. No visor, no speaker effect.
I'm going to roll without the visor for a while. The difference today was pretty dramatic. The Shoei has a small nose/breathe guard thing. I tried it once when I first got the helmet, but I didn't see a need for it. I'm going to install it again and see what happens without the visor.