Although I've not used the Sploosh, I liked seeing another person using it to 'puddle hop' to maneuver through enemy ink with great speed. As the 'splash' size is similar to the burst bomb, Sploosh makes the 'hop' most convenient.
I actually main the regular Splash now. It's really quick and with a RSU main I can get around really fast. I also love the Bomb Rush as it's super easy to get charged and by the time you finish using it, it's ready to be used again.
Damage is my only concern really. There have been many times where I hit someone the required amount but they never splat.
Splash o Matics are great. The guns a very accurate even though they have a lot of range, no RNG to worry about. Vanilla with the Suction Bombs is great and Suction Rush can take over Zones and force people out of areas, it's lovely. Neo's kit is amazing with Burst Bombs to extend your range and Inkzooka, this kit is something I wish a Splattershot had...
As for the Splooshes, they're decent support weapons, but the short range and horrid accuracy will always be a problem. They're fun to use.