(Disclaimer: I'm talking about the Warframe weapon, not the version used by Drifter).
I know some people have been slightly upset about the new addition of dual Nikanas, but I'm personally quite satisfied.
The first complaint is about the fact that the stance lacks forced procs, and I totally get that, but thank goodness they actually made it free instead of a 0.1% drop chance from random Duviri guy. I'm also seriously happy we actually have a new weapon with a comfortable and fast stance since the past few additions have NOT been that way.
As for Sun and Moon themselves, I'm ok with the stats being somewhat mediocre (I actually predicted like half a year ago that they would probably be worse in stats than my Prisma Dual Cleavers, and I wasn't wrong) because these are the starting set of dual Nikanas, and dual Nikanas will probably be way better when we get a pair with high cc/status instead of average stats for both.