User blog comment:Deshiba/Are you Critting me !?/@comment-4888212-20130518164238/@comment-4022742-20130518190207

That's where the second part comes in, balancing the crit so that it does less damage. It would be basically like buying a sheen in lane, it boosts your attack after you use a skill, but not by a whole lot unless you build AD along side it.