I second Ack-Ack and Soulyss, and I too miss Ripsnot's missions. The poor guy couldn't enter the arena without 20 guys yelling at him to post some missions.
To expand on Ack-Ack's post, the problems include: Inappropriate plane mix and loadouts, especially fuel, and poorly planned distances for the stated target altitude. Most missions are posted by bomber guys who can't keep a decent conga line, let alone anything better then a gaggle of bombers. If you don't take it seriously, it can be fun to watch them lead through turns that loose drones and of course, then guys start bailing out right and left. I've seen twenty player missions end up with less then half that by the time they reach the target area.