Eh...I definitely see the argument for removing critical strike since its one of the only RNG elements left, but really, its one of the only RNG elements left, so its not like EVERYTHING is luck-based. Luck is extremely fair: it doesn't favor any one person and every champion can get crit chance so its not like only Tristana can crit. He had an IE and a Static Shiv, that's expensive and also pretty dang high crit chance. Besides, Hai got a few good crits as well, picking up the only kill in what would have otherwise been a perfect ace. Other things let to C9's loss here other than those few lucky crits.