AD items need a collective nerf
**Simply put, because of the cumulative power and the proverbial "trifecta" of Crit, AD, and Attack speed, it results in near constant balance issues with AD-based champions. **
In comparison, AP-based champions are seldom a problem as their items are not over the top and are very specific in what they do; it also helps there is not such thing as spell crit or "spell attack speed". I'd use AP items as a guide in making your AD items more balanced.
If there is going to be a modicum of balance, we need to "de-fang" baseline AD items and make certain mechanics like Crit and Lethality champion-specific or role-specific. I'd make Lethality an Assassin specific stat that could only be gained by Assassins. Right there, that would allow you to more carefully balance the stat without worrying about ADCs building it or Bruisers or Duelists.** I'd also make Crit an ADC stat only**, as the damage amplification is so extreme that it can easily take a balanced champion and make them figuratively go off the rails in terms of damage.
Going a step further, I'd make certain items like
role-specific so we don't have ADCs building this or Assassin's building it, it would be for naturally tanky characters like
or
and their respective roles.
If the AD items never get fixed, we're going to continue to have these champions like
, like
, like
, like
, like
who bounce between balanced and broken as heck. These champions will continue to be hated and viewed as toxic until you fix the destructive nature of AD items, as they are right now.