The Schrödinger's champ
Every damn time there's a new champion with a high skill cap out they start out busted, with the minor exception of Yuumi (who was immediately hotfixed to broken status).
And yet also every time we get players:
Banning their teammate's intent because they think the champion sucks.
Inting, then flaming their teammate who got the champion for sucking.
Complaining about the champion on the boards for sucking.
At the same time also complaining about how broken the champion is because they played against someone that doesn't suck with it.
Apparently new champions exist in a superposition of states where they are both broken and useless at the same time.
And then what happens? People learn to play them and Riot has to nerf. Sometimes more than once. Because they were actually way too strong. It's been exactly 7 days since her release and Senna has gone from low 40s WR to 50% (as #2 most picked support champ). This is even faster than with Yuumi, which means she's probably due for a nerf next patch when she turns out to be even more overbearing than post-hotfix Yuumi was.
You're going to play with the new champ. How about not being an ass to the other players just because you don't want to do it now?