Revel in Murder is completely broken but that's probably the most powerful use I've seen with it. Good luck for your runners if you use that one against them.
I was trying to think of bigger abuses of Revel In Murder that might be possible.
The obvious use is a shooting adept. An Ares Desert Strike, a Krime Boss, or the truly unsubtle choices like an Ares Antioch-2 or Vigorous Assault Cannon... all tricked out with Take Aim modifiers, max lethal ammo, and smartlink modifiers. You have to cut through armor, but with edge adding to your dice pool, you've got a decent shot at it.
One thought is that it would be indirect elemental spells, particularly with LoS(A) spells where the test limit is fixed at three. They aren't very subtle and can't be used in a lot of situations, but when the moment is right, they'd be devastating. If you are willing to suffer the drain (you'd likely want a fetish to keep it from being outright deadly to the caster), you could bump up the force to a nasty level, and your net hits would likely offset a lot of the armor soak of the defenders. Edged at Force 12, with say 7 net hits you're talking 19Pv-12 to a 12m radius... with that high AP, even a pretty well armoured opponent is not going to soaking up enough damage to survive that hit, and of course you only need
one person in the radius to die to get your edge back. If your opponents aren't too heavily armored, you could even cast two spells... Say, 2x Force 8, would get you some nasty stun damage (daredrenaline never looked so good), but would opponents would have to suck up ~11Pv-8 *twice*. I think that might be even more effective than with a WMH loaded direct damage spell, though those spells would be great for picking off the survivors.
Certainly with high strength melee/throw adepts I could see some abuse. A cyclops with maxed out strength, missile mastery, improved throwing ability, agility boost, and precision throwing could spear people for 19Pv-1 (20P if they use SURGE/Genetic Optimization/Exceptional Attribute to boost their base strength to 12). It'd be particularly fun with improvised throwing weapons where you normally have a low accuracy limit impeding your effectiveness. Being able to toss a credstick through the head of someone 50m away and getting your edge back seems pretty insane. While you don't have the range advantage, swinging a combat axe for 21Pv-4 or 22Pv-4 is going to leave a mark (on someone's grave), particularly with some edge dice added to the pool.
Some exotic melee weapons could work, a melee adept with a garrote (particularly a monofilament one) could wreak some pretty terrible havoc. A monofilament whip might do okay, though against tough you'd probably save your edge/finishing move for the second attack.
Probably the craziest and least subtle one I came up with though would be using a Blast Shield. With a 20Pv-4, someone is going to die even without net hits to pile on. The only problem it is ridiculously unsubtle carrying around one blast shield, let alone a bundle of them.
In the end though, I don't think Revels in Murder is going to be quite such an advantage for runners, as dropping bodies everywhere you go just isn't that practical. If you start leaving dead bodies everywhere, you're going to face a HTR team on a regular basis. That can really cut into a runner's life span.