Check the mod priority guide:
https://docs.google.com/spreadsheets/d/1ty239kyJbBs1sLhTo1JvSWuN0mIJsK1nwVdI6OLLtXo/view?rm=minimalPPSh-41 MOD is undeniably cute as heck, but an upgrade can’t live on cuteness alone. Thankfully for her though, it doesn’t have to, but it will require some investment.
PPSh-41 MOD by itself is not good. It opts to tie her grenades into incremental buffs for other SMGs through medals that are gained when she throws her grenades. An interesting concept, but otherwise not a useful one. Even though they persist for the entire map, the fact the buffs only affect SMGs is really unfortunate and she finds herself still not worth using without her SPEQ-set.
However, she now has a SPEQ-Set, and this has found some use. With all three of her Special Equipment, her grenade will gain a larger radius and can now crit. On top of this, she will gain 3 medals immediately after her first grenade (which immediately grants the teamwide damage reduction for SMGs), and has new buffs for 4 and 5 grenades. The most important one is 4 medals, granting a substantial Crit Damage boost. 5 medals gives a huge AP boost, but this is not usually that helpful for her in particular, outside of maybe a couple of farming cases.
So overall what does this mean for PPSh-41? Well she has actually done the unthinkable and made her Hand Grenades potentially worth something! With a large AoE and access to crits, PPSh’s grenade can output a fair amount of damage, making her useful for large group situations. It’s not making her a top tier SMG or anything like that, but you might find usage for her every once in a while. If you can’t complete her SPEQ Set, skip over PPSh entirely. But if you can, she does actually have some stuff going for her. Assuming what you’re looking for is some big boom.