I use a full-face helmet for commuting, and I like it a lot better than the regular bike helmet I used to have. After a decade of using motorcycles as my only transportation I'm used to having more coverage than a normal bike helmet offers. And I much prefer the double D-ring fastener to the buckles on an ordinary bike helmet. Right now it's chilly and rainy so I'm actually wearing a lightweight motocross helmet with no vents (except the mouth vent). It keeps my head warm and dry. The weight of the helmet has never bothered me. The people who point and laugh are another story. I have worn it in warm weather and didn't suffer from the heat, but I tend to feel cold a lot so I may not be the best judge of that.

If you have any mountain bike shops in your area they may have some full-face helmets. But probably you'll have to buy online in order to find much of a selection. I just ordered a TSG Dragon helmet (I think this is a discontinued model) and am hoping it actually fits. That one and the Specialized helmets are the only ones I found that meet the Snell B95 standard. I figure if I'm going to bother wearing a full-face helmet it might as well offer maximum protection.

There are some models with replaceable padding that allow you to customize the fit with thicker or thinner pads. The cheek pads should be snug enough to push your cheeks in slightly, but not so tight you bite the inside of your mouth. And if you can wiggle the helmet backward and forward more than a tiny bit, it's too large.

Unless I'm mistaken, motocross and bicycle helmet chin bars are not tested for resistance to impact (unlike street motorcycle helmets); they're only certified for deflecting objects. So you basically have to guess at exactly how much face protection you'll get in an accident.