It'd be quite a nerf overall, but not because glorious Tactical Scan isn't a far, far better power than the pathetic PM. It's because the latter synergizes much better with Tactical Cheat. Scan has an extremely short cooldown but a long animation, which means you don't get any utility from hiding it in cloak, and in fact it takes up nearly all of the full second of damage bonus that you would normally get before cloak is able to disengage. Indeed, on the QMI it is generally better to cast it out of cloak unless you have an extremely heavy loadout, because by the time the animation finishes your cloak will be ready, but in the meantime you are standing there punching BOSH'TET into your cutting edge salvaged omnitool's keypad.
PM on the other hand has an inordinately long cooldown, especially at high weapon weights, but you can completely ignore this by spamming the everloving crap out of it from cloak, and its short animation hardly uses up any of cloak's damage window at all. It's an ideal debuff for an infiltrator (well, maybe not more broken than the DAI's Recon Mine+Cloak ) to exploit, but is otherwise a rather average or even lackluster power, such as on the Turian Soldier where you might use it twice all game if you get a clustered spawn or fail to headshot a Phantom. Since it also already has free, permanent wallhack, the only advantage the GI would get would be lack of requirement for LOS to engage the debuff, and perhaps be slightly faster boss takedowns (assuming a weapon where 12.5% more damage makes up for an extra second of not firing), and that's not exactly a weakness of its, anyway.
Quarians and Geth sharing a power? Paging QMR post about shooting them out the airlock....
Well, we all know what happened last time a duplicitous toaster tried to steal quarian secrets.
