If you take most of the games current roster and drop them in Season 4, the house would burn down.
Take all but a few ADCs, most mages, every tank and drop them in Season 4 with their present damage output. Imagine the absolute pandemonium that would ensue on the boards and reddit demanding nerfs for champs that are obviously broken.
What we've been conditioned to accept over time is kind of absurd. Watching vods from past seasons is seriously so disheartening.
They took my chess, and turned it into checkers :[