In reality tho you get a mediocre increase to Slasha. And since you need to be and stay in red to deal actual damage to kill anyone decent - the 15% crit to finishers is sort of irrelevant because you drop into green, unless you want to drop another actual dps tactic slot for Wot Rules.
Autohits are still huge part of choppa dps since they scale with rage, 25crit damage and Get stuck in, at least for single target. And you still need to apply healing debuff, 40% slow or even the best finisher in the game - Try an' hurt me - all or which don't benefit from it.
If we're talking premade full glass canon you'd get more mileage from simple Flanking with a Bork that debuffs Initiative.
Barely seen anyone here nor live using Strong finish, but if it works for you then go for it.
The only true use for the tactic I see is in kill stealing, when you run around like an asshole and try to steal killing blow with Weaklin killa. But even then the downside of dying to almost autocritting dots on you is too much for me.