Back when they first hired Ghostcrawler...

His balance design is just rotating power to champions. He did the same kind of rotational balance at Blizzard, nerfing onething then buffing another and suddenly you have a new overpowered thing. GC does this in league with keystones / items though.

Overall I think Ghostcrawler is doing a decent job, Riot sticking to the awful season 6 keystones isn't that great though I think they're something that just keeps messing up the balance. They also don't really feel like customizing at all, on most champions there is a definite best choice.

Just be glad we as League players don't have to put up with the guy that's leading WoW PvP design now, Holinka :D. He pretty much killed off PvP completely in that game it's not fun, balance is the absolute worst it has ever been in. But most importantly it's not fun and there is no distinction of skill anymore.