S tier: Generational talents who can make magic happen.
A tier: Very fast, very consistent drivers who make few mistakes and take advantage of all opportunities, good race craft, and spatial awareness.
Ricciardo may be OP A tier, or low S tier.
Maybe Norris, if he takes a step forward.
B tier: Very fast, somewhat inconsistent, and can be unbeatable on their day, but missing that little extra that higher tiers possess.
Norris(straddling between A and B, but he has time and potential)
Ocon(straddling between B and the tier below, IMO) not his driving, but his attitude.
Vandoorne also belongs here.
Muppet tier: Mostly there because of money.
The tiers are in order but the names are in no particular order, although they may show my prejudice.