I mained the Vanilla Inkbrush in the last game, and IMO it was the best the Inkbrush ever was. Inkbrush was never a combat-oriented weapon (if you wanted to kill people with a brush, Octobrush outclassed Inkbrush in every manner known to man). Inkbrush's biggest strength was its turfing abilities. You could carry games by simply maintaining turf everywhere and giving your team space to move (seriously, sometimes in S+ people would still jump right into enemy ink). Its sprinkler allowed it to maintain paint in one place as it went around painting the rest of the map, and its Inkstrike was perfect -- because it was rarely in the action, Inkbrush really appreciated being able to affect it from wherever it was painting on the map. That kit truly played the Inkbrush to its painting strengths, and when played right you could control the entire map, giving your team easy pushes and the enemy team a terrible uphill battle.
The problem with Inkbrush in Splatoon 2, now, is that they tried too hard to make it a combat weapon instead of a more paint-oriented weapon. Now it's got Splat Bombs, there's no multitasking when it comes to painting. Splashdown, I would even argue, is counterproductive to what the brush wants to do, because you have to give up time in keeping map control to jump directly into the fray -- the last place you want to be as an Inkbrush. Whatever kit they try to give it for combat purposes, it's never going to be an Octobrush, anyway. If you wanna play a brush right now, play the Octobrush until Inkbrush gets itself a better kit.
As the self-declared totally biggest Inkbrush fan ever, I'm with great sorrow giving it a "Nay" for Splatoon 2. I'm gonna be playing Brella instead for now.
edit: SHOOT, I really thought this was the Splatoon 2 forums. In Splatoon 1, I give the Inkbrush a big "Yay"!