Its not all pi55 taking. I started on an MTB, doing single trail, and a bit of simple downhill. I used a couple of different helmets an MTB type and a bmx/dirt jump type.
Both of them had low levels of venting. But looking at the pictures more than those we've been asked to forward an opinion on.
When I got a road bike and started commuting it wasn't long before I realised I needed a more vented helmet. I was sweating cobs. If your commutes only a mile or 2, fine. Anything longer, I'd look round for a budget vented helmet that fits.