Haarp uses deathpits properly. They are on one side of the map on the first point of a round. Like on stage 1, it's right out of spawn, but only an idiot or an Airblast could really knock you off. When there is little room to walk around, there is a railing. When you're at the helipad, you've got plenty of space and if you fall, it's your fault. On stage 2, it's a deathpit along a flanking route. That route to the point is very useful, and you don't encounter danger often, and when you do, you've got a sightline that can protect you from falling.
So yeah. Deathpits are awesome, if done correctly.