First pick or ban phase. Strong enough to carry a game based on good game play. Difficult to counter. Not completely reliant on team to excel.
Strong hero, but just enough of a weakness to keep them from Tier 1. Requires specific or multiple counter picks to effectively counter or may be a good counter pick themselves. Strong but reliant on team to perform.
Average Hero, no glaring strengths/weaknesses or enough niche strengths to shore up their weaknesses when properly drafted. Often requires team to draft around them to a lesser extent. Not usually worth countering, or if so, not difficult to counter.
Below Average. Not great, high skill floor, have to draft entire team around, or super niche heroes that are only good on a small number of maps. Easy to counter.
Far Below Average. Very rarely worth picking, or only good in very specific situations.