vShot was the undisputed king of 5.0. Can't really say yet how much of an impact the Zooka nerf will have, but my gut says that I doubt it's going any lower than top 3 still. Right after that you have Zap which is a staple of nearly every comp, and arguably Ballpoint next.
Charger: E-liter
Heavy: Hydra, Ballpoint, Nautilus
Blaster: S-Blast, Clash
Brush: Painbrush
Sloshers: Explosher, Default
Stringers: All work
Brellas: None. They all suck.
E-Liter is very strong but I would argue Pencil is best right now. It's the only Charger that can paint, and it has Cooler.
Hydra's okay at best, we'll see how the buff plays out but so far it and Mini have been the two weakest Splatlings - not nearly as good as Heavy or Edit.
Range is really the only good Blaster. Even Chara dropped S-Blast, and Clash has consistently been one of the worst weapons in the game.
None of the Brushes are any better than mid-tier at best, and vBrush would be the best of them. Painbrush buff may be something, but I doubt it's enough. Weakest class overall.
Explo has a Zones niche but is very much not in the same tier as vBucket or either Tri. It's really only viable on certain maps, and the LDE nerf hit it pretty hard.
Reef has a niche but both Tri-Stringers are bad.
sBrella and sTent are actually very strong, blessed with perfect kits, and even vTent has a niche since Vac got buffed.