Are Champions always deemed OP when they come out?

I noticed that the day that Illaoi came out, everybody was whining about how OP she was. When Jhinn came out, same thing, any time somebody carried in a match with Jhinn you'd get something like,"big deal, you're playing a broken champ," in chat. Now that Aurelion Sol came out, he's banned in 70% of games I play, despite the fact that he's seemingly hard countered by any melee assassin champ (thus far, Kha'zix, Yi, and Shaco have all fared exceptionally well against A Sol midlane, in my experience).

Is this normal? Do people always have a massive knee-jerk reaction when new champions come out?

reposting this after I put it in the wrong sub-forum...