No Overpower sucks because it adds another gcd to fill on top of other gcds where there's times you have to let it sit for other abilities. It would be a lot better if they just baked Overpower into Slam where Slam would randomly have the Overpower effect. But nope, instead its a completely separate ability that cockblocks the rotation even more just like Rend.
Tactician resets just feel grimy when they reset way too much where you have to make sure you keep CS/MS off cd but somehow maintain Trauma with Slam. It's just too many abilities fighting for gcds and adding Overpower just makes it worse.