Full helmet (BMX) for Commuting, what is the current 2014 opinion?
Protection level is a personal preference matter.  You could just as well wear downhill style full body armor to commute and if you are willing to sacrifice the mobility and comfort for that extra level of protection, I'd say more power to you.  So my answer is you should wear whatever makes you feel more comfortable mentally.  The reality is it's all shades of grey.  If a one ton pickup hits you going 55 mph, there really isn't much you could be wearing that is going to do you any good.  I've been hit twice now commuting, but have stopped wearing any sort of helmet in the winter due to temperature control issues.  I value ease of temperature adjustment more than any feeling of safety I get from a helmet.  

So much of cycling is personal preference that I have seen several folks in town wearing full face helmets on what is seemingly a commute, and it doesn't bother me any more or less than the brand of bicycle they are riding.  

Edit:  I do not recommend wearing any less than the level of protection required by law in your area.  My jurisdiction has no such requirements.