Aw, thanks for recommending my guide!
The others gave some great tips as well. If you want to get a feel for what the Inkzooka is good at, I would recommend using it in Arowana Mall. For example, bring the Aerospray MG. Its kit is incredible on this map, and the main weapon is very good for Zones. When I use it, I follow my Seekers to mid and start inking up the zone as fast as I can, hopefully getting my Inkzooka to take down anyone on the sniper perches and the side lanes. I also throw Seekers to their side of the map to prevent them from entering the zone. From there, it’s easy to establish and keep control.
The first seconds of having your Inkzooka are crucial because it’s when you really get to do stuff. People know that they need to run away as quickly as possible and they won’t hesitate to do so. Some might try to get in your face in order to overwhelm you. That actually works pretty well, unfortunately. Like Cuttleshock said, close-range Inkzooka pulls are only ever useful if your TTK is slow and it’s the only way you can survive. If someone is chasing you, well, they’re probably not that threatening because challenging an Inkzooka like that is a pretty bad plan. I’d suggest simply backing up and shooting in the direction of the enemy.
Inkzookas are essentially temporary Chargers, but better, because they don’t have to charge and can do some cool things. Aiming high up is absolutely disgusting because nobody can see it coming, and it’s really had to predict where the tornado will land. And of course, they don’t have a laser, so nobody can tell where you’re about to shoot. They can be tricky to use, but they’re really rewarding.