I've done a few rides wearing a full face motorbike helmet (one with a fixed faceguard, not a flip one), and it has its pros and cons. On the downside, visibility is a bit limited; it isn't as easy to turn around and look behind you but it is do-able. It's also heavy. My TSG Evolution helmet I wear most of the time weighs around 450 grams, but my motorbike helmet weighs three times that at 1.5 kilos. It is a lot of weight to have on your head but you do get used to it.
On the plus side, it's very warm which is good for winter riding, and if it rains, just close the visor and you're away from it (at least your head is). You also know that your head is extremely well protected, and as protection is the single reason I wear a helmet, I like that.
I occasionally do wear my motorbike helmet on my bike, but not that often. I tend to wear my TSG Evolution helmet for the vast majority of the time. Maybe just try wearing your motorbike helmet and see how you get on with it.