The Squiffer honestly doesn't have a place in the game, and that's mainly down to the other chargers, damage stacking and other weapons. Every other charger can grab Damage Up and play more aggressively, even with the nerfs to the scopes, Damage Up allows for aggressive play on the chargers (except the E-Litre, which was hit hard) but the Squiffer is the only one to not get affected by damage, which harms it so much. The Squiffer was meant to be a mobile charger but the charge times are too long so when you miss the shot, you often get splatted trying to get the next shot ready. The Bamboozler has more mobility and with the damage stacking (about 2 mains worth suffices), it can do a full charge and an uncharged shot to get the splat, especially since it maintains its range regardless of charge time. In fact, it often gets a 1 hit splat due to damage stacking since it gets pushed to a 90+ point damage so standing in enemy ink for a short amount of time helps that, as well as enemies already weak from your team attacks. Between the Bamboozler and the Splat Charger/Splatterscope, there's no place for the Squiffer, as both cover the range that the Squiffer reaches, but do it so much better. The Splat Charger has great range and charge times, and the Bamboozler has instant charge times, so they effectively knock out the Squiffer and its viability.
I like the Sloshers, but the Tri-Slosher gets knocked out by the Zimi, the Tri Nouveau is flat out useless. The Vanilla Slosher can Burst-Cancel, but has Inkstrike and the Deco struggles with the Splash/Kraken set due to poor ink efficiency and a heavy ink intensive sub. The Sloshing Machines are horrible, I really wanted to pick up one of these weapons and learn it for its fun name and style, what other game uses a Washing Machine as a lethal killer? But their start up lag, awkward hitbox for the vortex and questionable kits really killed it for me. Then along came the Soda Slosher, and I finally found a Slosher I bonded with and loved, it gives me a set to play the weapon in a way that was previously never possible, and is so much fun and has the viability. I've said it before, but when I spotted it on the Sheldon's Picks box in the Direct and the official pictures, I was hoping it would get a fantastic set, just because it had such a great colour scheme (also got coupled with a great name :p). I do want to get back into using the Tri, as it's also rather fun, and unlike the Zimi, I feel this weapon isn't a cheapskate Disrubbler weapon, so I will use it (I refuse the Zimi, as I feel that it's too cheap to use). So right now we only have 3 viable Sloshers: the Tri-Slosher (Disubbler), Vanilla Slosher (Burststrikes) and the Soda Slosher (Splatzooka). The rest either have poor sets (Tri Nouveau) or have a set that is done better elsewhere (Splash/Kraken) or just flat out suck as weapons (Sloshing Machines, which got worse with the Soda's launch).
I'm more of a gun user, and generally the midrange ones at that. I mained the Tentatek for the longest time (hence why it's my most used weapon), before swapping to the .96 Deco, then swapped back to the Tentatek after a while (before any of the major nerfs came in for the Deco), then eventually swapped round weapons because I felt like I wasn't getting anywhere. I've messed around the Splattershot Pros, the Dual Squelchers and even the Custom Jet (only because Splash Walls/Inkstrike is a horrible combo). At the moment, my weapons of focus are the Soda Slosher, Neo Splash, Custom Jet, Wasabi, Custom Dual, Refurbished Mini (due to the difficulty, and because it's less used), Bamboozler Mk III (May throw the Mk II in as well), Custom Blaster (will switch between this and the vanilla), Rapid Blaster, Tri-Slosher and the N-ZAP 85. That's a great variety of weapons, ranges, subs, specials and playstyles, which should hopefully help me improve as a player. Of course, the vast majority of these weapons are underused and off the radar, but that just makes the game better and more fun, as I need to work harder to succeed with these weapons. Admittedly the Neo Splash and N-ZAP are making their way into Ranked, due to the range, firerate and accuracy buffs to the Splash, and the N-ZAP seems to be coming in where other weapons are being dropped due to various nerfs. I never thought I'd see the day where E-Litres and other chargers would stop stacking damage, but due to 2.7.0 it has happened, with most only using 1-2 mains worth, rather than having 3 mains and 3-9 subs of it. They're also a lot less common, making ranked more fun due to not getting sniped every few seconds in almost every single lobby.