I did pay for pack weapons and I hardly regret it, the thing is they're useful when you know how to use them but their skill ceiling is a bit high.
Harpoon Bomber Cool for dealing with Scrakes but if there's one thing worse than a chargin' meat grinder it's an explosive chargin' meat grinder. Usage on Fleshpounds requires loads of practice. On the paper and theory, you stick one to its head and after it blows you throw a nade and stick another to its throat while it lets out the enrage roar. Requires pinpoint accuracy because of the distance you might want to put between you and the FP.
Pin corners and deny area. You can try to approach Scrakes now, don't try messing with FP until you have M32 next to this.
SeekerSix Useless, really useless "but" can be utilized. May be it's even more practical than Harpoon. The thing is Harpoon cannot be combined with anything but SeekerSix can be combined with Pipes.
Everybody knows that Pipe Bombs have a small arming time before going off. If you can actively dart pipes on the path of Fleshpound, you can push back and juggle it on the point, until Pipe Bomb arms and preferably finish with hand grenade and M79/M203 combo while it enrages.
ZED Gun Mk.|| Weaker than classic ZED gun on practice but alternatively a good pick for Firebugs who use Husk Cannon or Trenchgun. As a Medic or Commando, you'll find previous ZED gun to be more effective. Don't bother with ZED Mk 2.0 if you're playing one of these classes.
ZED Gun simply makes up for not using a rapid weapon like flamer for shutting down Sirens and heating up any meat shield around any other ranged threat like Husks and Bloats.
Not really practical but enraging a FP with Trench or Husk then enveloping it rapidly with ZED then unloading whatever you got greatly damages him. When he gets out of stasis field it'll be burnt and calm, reload again and finish it.
Bile Blower Joke weapon. Low ammo capacity, absurd damage; probably TWI wanted Medics to not go with the flow of battle instead of healing gormless tossers.
Only upside that it cause specimen to attack Bloats instead of you. It's sure better to take a Firebug's job as Medic if your team lacks a crowd controller but I found it to be better to use as a kite weapon with Berserker.