I've run it on the Punisher in testing, and unfortunately, only having the focus to modify is pretty crippling. The card, while not awful, just doesn't cut it compared to today's consistent 4+ dice fully modified attacks. Consider the requirements for this to even do 3 damage-
1) Must have a focus token, meaning you cannot have done a red maneuver or bumped unless you are getting the focus fed to you from some other source, in which case you are building a list around a synergy between multiple ships which almost always is not a strong competitive option.
2) Must roll all natural paint
and a bonus point,
3) unless you have rolled all hits, you are now naked on defense unless you are running some sort of action stack, which, considering the platforms for this upgrade, is going to be difficult to run efficiently.
I ran a Tie Punisher with Unguided Rockets, LWF, and Advanced Sensors to assure I could consistently get the focus. But even when I consistently got the focus, I still wasn't doing as much damage as I knew I could with other lists.
In my opinion, the saving grace of the Punisher is Lightweight frame and Accuracy Corrector. LWF is bonkers on a Punisher. Sometimes, you are rolling 3 dice at range 3, which is hilarious. Acc Corrector allows you to have a gun which needs no mods at all, so you can save the focus for defense, or boost to block or re-position, or maybe even drop a bomb. As noted, 2 hits isn't much in today's game, but if you can guarantee 2 hits without any other investment in a ship that is only maxing out at 2 hits 75% of the time anyways, it's really not a steep cost.