

Being a throwable, smoke nades may be thrown in a bad spot, especially when there are tanks or speedy frontline enemies taking the aggro. Enemies debuffed by a smoke are very susceptible to kiting due to their lower movespeed and RoF, and at the same time gives the tank limited facetanking power. Smokes come with a very low cooldown, and the debuff from them is very powerful, enough to overshadow your usual debuffs from HGs that only pop after 6s. At one point, smokes were among the best skills for maintanks, but with newer SMGs added to the game they're starting to show their limit. Outside of her godly tiles, UMP45 comes with her iconic smoke grenade.

Keep in mind however that critical rate buffs are largely ineffective during nighttime, where ARs wear PEQs instead of VFLs for Accuracy, reducing their base critical rate down to only 20%, or 26% with UMP45's tile buff (unless they're ST AR-15 AR or M4 SOPMOD II AR who can wear two accessories at the same time). You would expect such a tile buff to be on one or at most two tiles, yet UMP45's tiles cover all 3 ARs at the back, opening up her potential in 3AR teams. The buff she provides beats even 5★ SMG in terms of value. With the change in critical damage calculation and fairies, critical rate buffs have only gotten stronger since launch. Her tile buffs give a powerful combination of FP and critical rate, both being valuable to ARs.

What she offers isn't amazing tank stats or skill, although she does have nicely balanced stats overall, but by having easily the best tile buffs among SMGs. Since launch, UMP45 has always been regarded as the ideal maintank SMG when it comes to general content.
