I fought multiple R&R's the past few days and continued to have little trouble with them, based on my personal extensive playtime experience, the complaints still feel overblown. The only kill I was surprised by was when I got cokcy and taunted from a pillar on Fistful of Sand, as Hans, and it 2-shot me. First shot didn't even wound me, but second shot killed me outright. Upon seeing that, Woody mentioned that it seems like the damage calculation may be off and sometimes seems to calculate damage more than once? Replicant felt like he was being 1-shot as Schneider.
Yes this gun will *decimate* certain characters. Others will destroy Alicia without her being any problem. That's how this game works. If it's bugged and causing random damage spikes, that should be fixed, but I have not had any trouble when playing as Hans, Lycus, Kuzmann, Konstantin, Schneider, just thinking offhand.