I thought there was actually a rule against posting about helmet preference on the forum but then perhaps not. Many longer term riders who wear open face helmets get a bit tired of being lectured to by riders with only a few thousand miles under their belts. I think the answer really depends on whether you're the sort of person that falls flat on their face when they fall. Me, I nearly always ride with an open face. I've had about two dozen crashes in my time - some minor, some quite serious. I'm still pretty.
I just like the wind in my face, I like smelling the roses and I like having the occasional chat with drivers/riders that piss me off.