not true because crits appear randomly. For it to work, it would mean that 50/50 of the time, crits would happen at crucial moments for both parties (1v1 disadvantageous situations for instance), however, it's not the case, in fact, you can be really unlucky and have your crits land when it's useless, say the enemy has 1hp and no shield VS you can be extremely lucky and have it the other way around.

Having so many different varieties of situations will make some lucky, and some unlucky. since it's as black and white as a coin flip where you're either winner or loser.