Gnar is balanced

You mean a were-type champion using two distinct archetypes has wildy different damage types and utility based on what form hes in?

You mean a champion with skillshots and AoE damage (which has decent scaling but low base stats) does a lot of sustained damage? You mean a champion who is largely immobile but has high bases and high scaling does a lot of burst damage, and being melee, has tools to keep you in range?

You mean youre crying whiner who has never bothered to learn how to dodge skill shots or notice when gnar is about to transform?