What was the biggest mistake of Season 5 in terms of balance?

Juggernauts was a strange decision to implement right before their world tournament. It is a huge change to balance against all of the old, and even new champions in such a short amount of time.

I'm happy they're making these kinds of changes, but I think such drastic changes should have come all together, early in a season. (ADC role is next, isn't it?)

Initial Runeglaive is probably the worst thing to happen from a gameplay standpoint. But if we're talking in terms of fundamental mistakes... maybe the introduction of ? This item might as well not exist.

Juggernauts? Noooo

Initial Runeglave and the problems it caused? Yessssss

Still no ranked team builder.

every jungle item besides warrior, lux buffs, elise buffs, juggernauts

Preseason Mmm delicious freelo

Kalista.