Playing on the previous zombie maps, some of the most undesirable weapons in the mystery box were always the launchers (the M72 Law and the China Lake). These weapons fired slowly and were useless at close range due their dangerous splash damage.
With the new Ascension map, and the addition of Ph.D. Flopper, the tides have turned in favor of the launchers. The Ph.D. flopper eliminates splash damage from ray guns and explosive weapons. This of course improves the power of the ray gun, but the ray gun was awesome already. The real treasure that this new perk unlocks is the delight of close-range pyro-zombie death. Previously it was prudent to exercise some self-preservation caution and not fire your rocket launcher at close range, less you blow yourself to smithereens. Now, however, you can let fly the ordinance when the zombies are in your face. Pick up some Ph.D. Flopper and try it out; the M72 Law is handy for dispatching large clusters of zombies in later rounds. And don’t forget to give the Mustang Sally a whirl. Fifty rounds of explosive ordinance with no splash damage!