Tanks are still taking STR accessories.

[Ragology]

I think there's diminishing return when stacking crit, my SMN used to have about 800 crits but rarely procs, about the same when my crits was about 550 - 600.

In Dc universe online, crit was divided into two categories: Crit chance (critical hits occur more often) and Crit magnitude ( critical hits did more damage.)

I believe that crit in our game was changed such that everyone has a base crit rate and any additional crit from gear/abilities/melds will only raise the magnitude, not the chance.

So your summoner still has 20% crit rate ( I don't know the number, just making something up) but if you were to stack crit, instead of your Ruins criting for 700 damage, the ceiling would raise and they would crit for 780 damage.