It will only be more viable if either the multishot or rapid fire performs better than M6 (i.e. simply deals more damage overall)
If they added my idea do you think it would make UE more viable to marauders with both multishot and rapid fire as good UE builds or no I'm just wondering because I used to love playing with rapid fire before when it was not great but good back in 2.2 or 2.1 the patch right before we got UE and with the new gear skill buffs and what not I don't see why they don't make a set for it or add a bonus to a set for it it would do crazy amounts of dmg
Sadly, Rapid Fire really isnt good because standing and hitting one target at a time isnt good for GRs. They need to introduce more complimentary legs for it to work.