How To: Flak Cannon

I think it's one of the best CC powers in the game with 5b. Stunning everyone (including berserkers) with the Havoc means dead everyone (including berserkers). Being able to stun enemies with all three powers the Mercenary has means not having to spec into Andromeda's sad excuse for a Rage tree.

I must be missing something. Can you elaborate on its intended function?

Been running Havoc Trooper for the past 4-5 days? simply to try to complete the flak cannon achievement. Its a great tool for CC as mentioned and it also does relatively OK damage. Mainly use it to interrupt snipers while I glide gracefully toward them.

I find that I don't bother stunning Berserkers. Just incinerate and face tank while dakka dakka

I'm just not seeing a lot of utility from it. Admittedly, I don't usually use it from the air, but I'd still love to see an evolution choice between Inferno Shells (+armor damage and fire prime) and High-Explosive (combo detonator).
Even if that was buried at rank 6, I'd actually take the power for synergy's sake at that point. As it stands, it feels like it doesn't really do much that Frag Grenade doesn't do better. I definitely take issue with the claim that it does "ok damage." Maybe for a 8-10 second cooldown, it does, but I expect a power-cell based power to have much higher damage to be worth the run to the crate(looking at you, literally every other cell-based power).

No you need to be a Krogan berserker and spam flak canon every 3 seconds while standing still.

I honestly like the Havoc a lot; she's one of relatively few kits with no obvious trap choices in her passives. I don't think saying "all she needs is a specific UR weapon; go play the slots" is a particularly strong argument, but that's neither here nor there, especially since I run her with a Black Widow.

It seems to me, however, that flak cannon requires 15 skill points to actually have meaningful CC, particularly on things that are worth stunning (most of the things that it can stagger without 5b are faster to just kill), and I'd rather spend those points on having a flying, tanky weapons platform that can prime and detonate.

It's even more egregious on the KroMerc, since he has two ways of priming and none of detonating, isn't particularly good at aerial gunnery, and has to be compared to the Outlaw Berserkers who have a magic, better version of the power that does damage and passes through cover on a straight trajectory.

I don't think you're lying, or anything... I'd just rather have Concussive Shot or Frag Grenade on both kits.

We had a long discussion about effectiveness of hovering a while back. I'm not saying my way is the only way to play Havoc Trooper but I specced her following Abramsrunner's build and it just chunks everything. Short range, long range 

The vid was more toward hover face tanking not so much so flak cannon use.

And that vid is an excellent demo/endorsement for the build tatsumaki. I was lukewarm on it. Now I must haves.

Here I come check the post to see if I can find the answer for whether I should invest into Flak Cannon for my Krogan Mercenary or not..

yet all I see is a Turian soldier picking on one Raider...

Don`t tell me this is all Flak Cannon is good at. Is this one of those sarcastic posts?

You Krogan FOOL. Flack stun a group, melt the group with flamer and then KILL THEM ALL WITH YOUR FALCON MUAHHUAHUA.

I never had so much fun BEING the Beserker!

Flack spam is capable of doing great mook damage!(Helped on everything but hydra to be honest)
Flack Spam can even bounce off walls! Surprise that bitch pariah from behind!
STAGGER those GODDAMN OBSERVERS!
Even the GOLDEN KETT can't handle the mighty FLACK SPAM.
MAKE ALL OF THEM FEEL THE ANNOYANCE OF FIGHTING THE BESERKER. PUT ON POWER CAPACITY JUST TO SPAM IT(not really necessary, 3 is just fine). MUAHAHAH

Falcon for that sweet sweet aoe damage
Basically: 6/6/5/3/6
Flamer: damage, reach, and blinding heat
Fortify: mobility, shield feedback, and then unmoving defense

Cannon: damage and stunning
Rage: just all top

Be aggressive as hell like a TRUE KROGAN. Brings me back to ME3 days :,)

Not really. The other passives on the other abilities/passives are so good that you can't really pass up the 6 points for a little extra FLACK SPAM damage.