We'll have to see the entire spectrum of abilities or items special effects.
Maybe later in the game there will be a cool combinaison that would be worth taking guerilla.
Or this is simply a combat opening. If you start a fight with a Mortal Blow + Guerilla as it stands right now you will one shot pretty much anything.
Having your rogue sneaky at the start of every fight (doesn't cost you any action point to be sneaky before the fight) is still a free 25% damage increase.
Now, I am not sure what you mean with Warlord but if you mean the Warfare Source ability, it is simply a completely different skill with a different goal.
Mortal blow is a Pure Flat and mean damage ability.
Overpower is an armor destroyer (you need high armor however) with a great CC component. Not really a damage power house.
I have a Shield tank with 500+ armor fully buffed, he could destroy the armor of an M1A2 Abrams tank
