Lethality Buff, And Its Surprising Effects On Obscure Champions

Where to begin.... So we all know that lethality has gained a significant buff recently, and I thought to myself "Eh, ADCs that use that are going to be tougher now. Should be healthy for the game to combat the ADC in 2017 crisis (xD)". I had no thought as to any other champion types (Other than assassins) that would massively reap the benefits of these buffs..... and then there was Jarvan. My four man premade entered a game, and the enemy team locked Jarvan into our Poppy. All I was thinking was "Tank with CC", and by god was I wrong. This Jarvan decided to think outside the box, building Duskblade, Edge of Night, Youmuu's, and a mortal reminder. Our semi-new Poppy didn't do all that great against him early, but three kills and he was off to the races. He would roam, one shot someone, come bot, one shot someone, covered the whole map with one shots. He ended the game 23/1/7.... an unholy score even for a fed lane. We may have sucked, but Jarvan with the potential to one shot anyone on our team with two clicks, or even a single ult was not only ridiculous, it was unfair. I figure that I am making this forum post to ask anyone else if they have seen weird Lethality buff exploits in their game, and get the word out about the possibility of this lethality buff becoming a major issue to the health of the game. Thanks for your time if you've made it this far, and respond with your own horror stories of the lethality buff! Thanks again, and good luck!