I was originally playing Poppy as a full tank, working with her W passive to put her over the edge
Now I've realized that she's meant to be played as a typical tanky bruiser with 12/18 masteries so she can one-shot squishies if she pins them and be almost completely unkillable while doing so.
I'm glad I've stopped trying to play a clearly tank champion as a tank and moved on to building her as a bruiser. It's been much more rewarding.
Poppy players, what have your experiences been with Poppy as a bruiser? I'm really loving the Iceborn Gauntlet+Black Cleaver build with her ranged passive.