Maiming Strike will grant a flat +90% chance to deal critical hits, in addition to the weapon's (modded) critical chance. This effect only triggers for slide attacks.
This stacks with Cat's Eye which gives a flat +60% critical chance to attacks.
The +90% critical chance provided by Maiming Strike is multiplied by Blood Rush which leads to very high critical chances and critical damage multipliers on slide attacks. See the full equation for details.
Combine with Berserker on any melee weapon to easily generate attack speed, with a stronger effect than Fury, for the same cost.