User blog comment:BIA-Kaboose/The Problem Behind Balance/@comment-5605969-20131211161837/@comment-1330314-20131211185803

That's actually completely my point: Jax and Kayle are good (though Riot has acknowledged that they're still figuring out what to do with mixed damage champions in terms of both balancing them and giving them a reliable source of penetration), but are also good because Riot reworked them several times until their gameplay was healthy. Poppy, on the other hand, is a lot harder to rework, since it's her core mechanics that are causing problems (i.e. her passive and ultimate). Right now she's unviable because her combo relies on her pinning a target down to a wall, which makes her effectiveness extremely situational. Shaco's also part of the "old guard" of assassins who are overpoweringly strong early on but fall off hard in the late game, which Riot also wants to change. I'm definitely not saying LoL is completely balanced, just that it's evolving towards a better state and is still catching on with some of its older parts.