I don't think they're all that hot - they're incredibly well ventilated compared to what I was wearing 20 years ago. And I don't think they're dorky looking at all. My helmet looks cool.
All I know is I had no use for one 20 years ago until I clipped my (future) wife's front wheel with my rear at 20-25 mph and the ONLY thing that saved her was that her forehead hit hand or arm which was between her head and the road. That's all it took. Changed MY mind toot sweet.