Why people say that Canto is weak? Well because there was a bug, which made quickhacks deal 1000% damage, so they would instantly kill everybody with synapse burnout and think that it suppose to be that way. It also has only 4 slots for quickhacks. I don't know what is the problem with that, Ping, Reboot Optics (for Smart Weapons), System Collapse and Suicide + Blackwall Quickhack feels enough for me.
Some people say that Erebus is really fun. But even with all perks and cyberware, the gun literally deals 0 damage on very hard difficulty. Canto, on the other hand, one-shots and spreads to 6 enemies.
Don't want to sound like a sadistic psycho maniac, but the sounds which the enemies who get that quickhack used on them make is very pleasing. It is not that silent "suicide" quickhack.
Every spread of that quickhack requires RAM, so it eats your RAM and HP very quickly. In order to use it non-stop, you need a special build:
So what you need is:
1) Max RAM: +2, +6 from Frontal Cortex Cyberware. +1 from Skeleton Cyberware.
2) Max HP: +40, +15% from Skeleton Cyberware.
3) Max RAM regen: +0.3 RAM per second from Frontal Cortex (also helps a lot for hacking during car chases) and +3 RAM for each 100 health lost throw Skeleton Cyberware.
4) Max HP regen: +200% from Integumentary System, +7.5% Health for each killed enemy, +110 HP and 6 ticks of 23 with autocast throw the Circulatory System.
5) The length of Overclock will be increased by Axolotl for every kill.
That cyberware enhances the perks:
Because you only use Blackwall since the moment you get it, you can completely ignore all the damage bonuses and use all these free perk points to get all perks for smart weapons and smg's or shotguns. Making them deal full damage against half of the enemies, while the other half is getting killed by Blackwall.
This part gives you 30% health bonus in addition to the blood pump effect and huge bonuses to the health regen, health item recovery rates, which are crucial for blackwall quickhack.
And this part gives you even higher health item recovery rates as well as maxed cyberware capacity, overclock length and cooldowns.
I would usually upload it on the first enemy after ping, which would cut its upload time by 50% in addition to 35% from the Cortex cyberware and 10% from face clothing. After it almost uploads onto the second enemy I would activate the overclock.
With 32 base RAM (up to 38 with boosts), 750 base HP with adrenaline (up to 1000 with boosts), huge regens and 3 health items, which also have huge cooldown bonuses, you can use blackwall indefinitely, enjoying your enemies dying in the pain.