s+
Champion that is pretty strong and must be banned/picked in every ranked game.
s
Champions that are worth picking early on the draft. They work with any team comp.
s-
Champions that work against almost every single enemy comps with some exceptions. These champions are mostly picked to "counter" other champions.
a+
Champions that can help the team out with the role needed. Try to pick them later on the draft if the team comp allows it.
a
Champions that work under a specific team comp. They are not good against every team comp, so choose wisely.
a-
Champions that get too easily countered if not careful. Early game they can be good. Late game, not so much. Only pick them if you are feeling comfortable.
b
Champions that deal inconsistent damage/healing. Only pick them if you are feeling comfortable.