When I was playing earlier the clouds came over, the rain poured from the sky and thunder was going off while on the ground bullets whizzed through the tress and explosions went off all around. Lots of people died.. then I took their jeep swearing now that my clothes were soaked.
I think the weather mechanic's are fine. It dosen't rain for 12 minutes and then full sun after 5 minutes in real life. The way they have it is more realistic, not constant weather changes that's really fake.