User blog comment:Muffintehbrony/Poppy, the champion not many give love to/@comment-4652200-20140305175728

Sadly they are intentionally keeping her this way because:
 * her gives her a lot of (hidden) tankiness/survivability without having to buy any defensive items
 * her is extremely strong, has almost no counter play and allows for toxic gameplay like risk free towerdives, bursting down the ADC while ignoring the enemy team etc.

Here is a quote from Morello: "Well, there are two choices; I'm OK with both to some extent;
 * Rework Poppy and make her a real pick in League, balance appropriately.
 * Don't rework Poppy, and never ever buff her, and nerf her if she ever sees play."

- Morello

TL;DR: Poppy needs/is getting a rework. If they buff Poppy as she is now she will come in ranked like a wrecking ball.