S tier-
Cypher - Even a noob can hold a site and get kills with some good trip setups.
Omen - What can't this agent do? Love getting that flash.
Raze - Can't go wrong with a Raze in your team.
Sova - Good utility, fool proof kit.
A tier-
Neon - Low elo can't aim at a running Neon.
Jett - Similar to Raze but requires a bit more skill.
Killjoy - Ult is just so good, almost guaranteed round win.
Vyse - Delays the enemy team enough to run the whole map twice.
B tier-
Fade - Just a slightly worse Sova.
Reyna - Either the worst shitter you've ever seen or a giga smurf.
Tejo - Pretty good, but lacks some recon or info gathering other than the drone.
Brimstone - Feels bad to not have rechargable smokes.
Gekko - Nice balanced kit.
Viper - Would rather have an Omen.
C tier-
Kayo - Good agent in theory but the chances of being team flashed is certain in solo queue with random teammates.
Astra - I feel like her abilities other than smokes and ult never have an impact on the game.
Phoenix - Got good flashes at least.
Skye - Jack of all trades, master of none.
Clove - I don't expect anyone that picks this agent to put down any smokes at all.
Breach - Difficult agent to use effectively at low elo.
Deadlock - Looks like a good agent, but always has low impact for some reason.
Yoru - Difficult agent to use effectively at low elo.
D tier-
Harbor - Unfortunately just a weak agent in general.
Iso - Giga baiter, doesn't know the meaning of entry.
Sage - Noob magnet.
Waylay - Trash agent, her ability just baits the entire team.
F tier-
Chamber - Braindead insta lockers who think they can aim but can't hold a site for shit despite playing a sentinel.