Just because you seem to be open minded, he is a functional character. Just difficult and complex. You have to outplay your opponent more than they have to outplay you but he has the potential to work. Most the people in the Zwei soul arena crying arent using him how he should be, simple as that. Which I hate to say since I mod the arena. Sure he's weaker than most the cast but people saying he is absolutely terrible/shit/can't win are exaggerating. A lot.
Open-minded? Nah, just... minded. I honestly don't know ZWEI that well, the impression I get from what I've read/most have told me was that he's just pretty gimmicky (I still giggle over the quote "ZWEI is too gimmicky to deserve a buff, get him off the roster"), and I figured that impression wasn't entirely untrue since I haven't seen ANYTHING from the character since the days of yore surrounding the launch. I'll try to STFU on the subject and learn more about him, which will be hard to do since I have just zero desire to play the character, haha.
Back on Nightmare nerfs, I doubt anything will happen... yet. Considering the nerfherders can't even get their stories straight I don't see how it could.
The whole thing is nonsense of the highest order, though. It all just translates into "WAAAAAH NIGHTMARE PLAYERS SHOULDN'T BE REWARDED FOR OUTPLAYING AND/OR WHIFF PUNISHING ME WAAAAAH."
Which is what crying for nerfs for ANY character before we even hit the
two month mark of a game's lifespan sounds like anyway.
On the bright side, everything that taffertier said on this subject was unadulterated comedy gold, so there's that.
Really, Nightmare doesn't feel remarkably different from where he was in SCIV, just a little buffed up by having some actual rewards for his risks now.