Really? I've only seen straight up blind hate out of the usual few closed minded types you'd expect it from. Mainly what I see is people asking if the game is good, do people still play, why do people like it, etc. Splatoon also got hate at first, but eventually they got bored and it became cool to like Splatoon. Of all Nintendo games, I think it's definitely still the Fire Emblem community that has to deal with by far the most hate. I mean the great divide Awakening caused was 4 years ago yet the flames have yet to subside, at this point they probably never will.
I'm pretty sure Splatoon only ever got hate before releasing, which makes sense because once everyone got their hands on it it was clear how much fun it was.