For those who complain about lethality
Did you know that all 3 lethality items gives 57 Armor Pen at max level?
For fighters/bruisers/tanks, ONE armor/health item (Sunfire, Thornmail, Randuins) more than cancels out THREE ITEMS worth of armor pen.
If you're a mage or ADC, tough luck, Zhonya's and GA don't 'quite' cancel out all 3 items worth of armor pen. But they do cancel out more than 2. Throw in the fact that they have the biggest survivability buffers in the game, there isn't 'much' to complain about.
If you're still getting bursted, really consider Tabi boots over Berserkers. Low damage is more damage than no damage.
Also, if an enemy AD assassin is tearing up your game and you think they'll oneshot you, then even as an ADC you SHOULD consider a full-tank item like Thornmail.