Crit is by and far the worst mechanic in league

It takes champs that are meant to be played as DPS, and turns them into burst, even burst per second champs. Mid to late game these champs should not be doing ~800 damage with 1 auto, killing the enemies mage in 2-3 autos.

Marksmen should be good at 2 things; taking objectives (towers, inhibs, barons, drags) and DPSing down the enemies front line. Not diving in being empowered by 3 different champs on their team and outright killing the entire enemy team because of steroids and overshielding.

Crit in its current form is upsetting that balance. It turns marksmen from DPS int BPS. Because every crit marksmen gets + 2 crit items, and then deals ~600-800 damage per auto. So, they are better at killing enemy mages and marksmen than they are at killing enemy tanks.

Crit could be made to be healthy; it could be implemented as a DPS increase similar to fervor of battle or press the attack. Attacking (preferably the same target.) increases your damage against that target. This is capped by the amount of crit chance you have, with IE extending your current cap stack by 50%. Stacks are not lost when switching to a new target, but drop off by half after 3 seconds, and completely off after 5 seconds. Stacks apply to champs and large/epic jungle monsters.