"OP Champs" is usually a synonym used by those who die for "failing to mechanics."
Tryndamere doesn't do OP damage, he does the same amount of damage as any Cait or Twitch or Shaco, they build the same and infinity edge does a huge amount of critical damage when it procs. This doesn't make any particular toon "OP." Tryndamere is easy to counter, ignite a second after he ults and run or stun him and he is dead. Ignite lasts longer than his ult and he will die, nor will he be able to regain health from his heal because ignite still ticks him down.
I am not saying every single thing in this game is 100% balanced, but I don't think Tryndamere needs a nerf. I shut him down pretty hard and even when I am in a rough spot as a tank, Thornmail + Randuins is enough to permanently shut him down.
Shaco boxes are not OP. People just don't buy Oracles or Pink wards and end up getting screwed. Think about it this way: If Shaco did not have boxes, he would be a worthless champ as he has no real CC. He would not be able to jungle, he would not be able to bush gank, so then what role would he fill? Nerfing a champ so that you can face check bushes isn't really a solution, and just encourages face checking to meet your death.
People are bad, I agree. It's too easy to get to 30 without learning anything important in this game. But don't destroy champions in your campaign against noobs.