Champion Pick Control
This is more of a ranked/Level 30 suggestion so no need to fret over it so much.
Go ahead and downvote me to elo hell tryndamere/yi/katarina mains

are good examples of Easy-to-Play (Freelo) champs used in ranked.
It gets annoying when laning against them as you can't really outplay them because outplaying them is near impossible,
Q will delete you in half a second without a chance to hit back and
can just AA you twice and spin away. And
will just... you know... yeah.
People justify playing these champs because they're fun, however its at the expense of the opponent (thats you :) )
I'm suggesting we reduce the amount of IP & LP awarded after a match (Just like Beginner CO-OP mode) for using these champs to discourage playing these champs after Level 30 or ranked. This encourages summoners to play more skill-oriented champs that could at least provide a chance for them to be outplayed.
TL;DR - These champs are ruining the fun for others, we need to discourage summoners from playing these by reducing IP & LP awarded.
Pending circlejerk downvotes...