I think he is top tier though… usually considered better than Kaede, Kagami and Setsuna unanimously which they are usually mid/top tier While Kagami is usually top tier, Kaede and Setsuna are arguably equals to each other, moriya is considered to be top 2-3 best character in the game… _not including boss characters_
Moriya actually is rank SS in the tier list. The best comparison I can make to this guy is Melee Fox, once you reach a certain level of skill, you can eliminate your opponents.