This is what you see in solo q

You are basically guaranteed to see AT LEAST 5 of these champions in every game you play. You are also very likely to see all 10 spots filled just by these champions. Good job on the diversity Riot.

for most annoying.

. Add in a couple more that are bordeline meta/high elo meta but hard to use like 
, counter picks like

. And there's the unsusual gimmick.
That makes around 30 champions that are usual. What other game do you know where you can pick out of 30 characters?
And before the juggernauts, there were even more champs to pick from.