Overview
SR-3MP is a Damage self-buffer SMG.
While other SMGs who try to deal damage through auto-attacks have severe limitations that make them not worth considering, SR-3MP has a SPEQ-Set that alleviates most of this. When equipped with both SPEQs, SR-3MP gains Surehit during her Skill. Additionally, all allies have their Movement Speed increased to 15 for the rest of the battle.
With the GZ SPEQ granting +25% Final Damage, she actually does pretty decent sustained DPS. Her new SPEQ-set makes Evasion a non-issue. She brute forces through almost all commonly seen amounts of Armor with the sheer amount of Damage buffs she gets. On top of this, she also provides the entire team with HG Movement Speed, which can be very useful in some situations.
All that being said, while her DPS is now up to par with strong AR and RF self-buffers, she still retains SMG targeting (random) as a big weakness.
If you need a backline DPS with Surehit and the targeting isn't an issue, SR-3MP is now a viable option to consider with her SPEQ-Set. If you do not have her SPEQ-Set, she is not recommended.
Yes, backline DPS. Direct fire SMGs are still not recommended, but SR-3MP can simply be put in the backline and supported with HGs.