Janna's actual problem?

The movement speed on and and and other items like that. It has nothing to do with her base movement speed, it has everything to do with her passive and how it stacks on top of stacks with items (ESPECIALLY , which is still extremely broken on anything that isn't Janna) to create ridiculous shield with decent poke.

Here's an idea: trim the needless stats on all the support items... after fixing ADCs.