s+
Always amazing, very hard to counter. Cassie shits on tanks and can almost always get out of enemies diving her. Imani shits on people diving her with root, root in general shits on everybody. Imani also has an ult that at worst pushes out the enemy and at best wins a teamfight on its own.
s
Very good and pretty hard to counter. Makoa has hooks. Torvald is not necessarily as amazing as S-tier if the enemy team knows what they are doing. Inara is the only pointtank not really affected by caut and simply outsustains all other pointtanks. Terminus' siphon has no counters except Makoa and Terminus gets huge siphon uptime with loadout, he can be played as both offtank and pointtank depending on map and he also has an amazing ult. Lian shits on all blasters, all dive and has an ult that allows her to play super aggressively. Evie is the safest flanker, never dies unless she wants to, has no real counters and the only real checks are Lian, BK and Pip. Can easily win teamfights on her own if she sees the opportunity or with big brain plays.
s-
Generally good but not top priority. Khan deals the most impactful damage of all tanks that are not makoa and has an amazing ult both for zoning and retaking the point. Damage immunity also allows him to negate a lot of ults and being dived in general. Ash has a massive shield with very big uptime that makes her an amazing offtank, also has a good ult. BK has huge snowball potential and allows big brain plays but gets countered pretty hard by midrangers (or at least denied from doing BK things for free). Pip out-1v1s every other non-tank in the earlygame and has an amazing ult. Grover is the best healer on small maps and has an amazing counterult. Damba is the best healer on the other maps and has a ton of utility with ult and random stuns. Zhin is the other flanker that is generally very safe to play but he's less mobile and can get counterplayed by things like Inara walls or BK/Drogoz hitting him from behind when counter is up.
a+
Generally solid but not the preferred champ for their role. Barik is a pointtank that can also work as an offtank, he has the biggest impact on the teamfight out of all pointtanks and can be played on both offensive and defensive teams but gets bullied out by Inara, thought he never really dies unless he wants to if played well. Ruckus is amazing on certain maps and not that good on others, but struggles a lot against Cassie and BK. He also only works on offensive teams. Sha Lin is generally seen as the weakest midranger, but due to the nature of still being a midranger is very strong. He can play both defensive and offensive and has no real bad matchups, but he's just harder to excell with than imani/cassie/lian. Jenos requires specific tanks to work correctly (tanks that can self-sustain well, Barik and Ruckus being the prime examples). Jenos comps feel almost unbeatable if they have advantage but feel very lackluster if they dont. Jenos comps also force you to play agressively, because you can't outsustain a team with a more traditional healer as Jenos, so you would lose the pointfight if playing passively.
a
Good in specific scenarios, maps or against enemy team comps
a-
Usable but generally there's just another option that's better
b
Possible with pocket strats but even then probably not the preferred option
c
No reason to pick these ever