Riot, I think, Colossus is a bit too much.
https://s12.postimg.org/61ewxraql/Colossus_is_op.png
All those tanky killers are so annoying. 350-400 AD and they're still unkillable. We finally need to separate damage and tankiness in this game. I can accept tanky Juggernauts, because they can be kited at least. But not Riven and Lee.
Also I need to add, Colossus lacks clarity. Now there are so many shields in game, I see them everywhere, and can't understand where it comes from. It's so confusing.