Well, more ARMS here.
First time through the game: "Okay, well that was good, finally a fighting game without an ultra-cheap boss at the end!"
Second time through: "Okay well that's another- OK WTF HE HAS 6 ARMS NOW, THAT DIDNT HAPPEN LAST TIME". So, he can attack in 6 directions at once with any timing he wants with multiple fist types and add throws to the mix WHILE attacking because of course he can and then I'm on fire for some reason and explosions and OMG METEOR. And this is while using Max Brass's basic abilities of tending to resist flinching, and staying permanently charged below 25% HP. Because apparently it wouldnt have been horrible enough otherwise.
So.... that happened. Here I used to think freaking Goro or Shang Tsung was hard, back in the day. No, they werent this guy.
So, I'd spotted that the game had already gotten a reputation for the singleplayer mode being extremely difficult even at difficulties well below max, and yeah, that turns out to be the case. Not just the boss, but the AI overall is very, very well done. Make the slightest mistake and it'll punish you really hard, among all the other troubles it'll throw.
Granted of course the real point of a fighting game is the multiplayer, but still, it's really nice to see one where the AI is actually well done. Often, it's kinda half-assed, relying on being more and more cheap on higher difficulties. I always found it really annoying, in many games. I'd still do the basic singleplayer to build up skill, but I never liked it much. Well, Smash was decent for it, to a point. Virtual On was the one big exception, so I guess it's no surprise that this is the second one.
And really, this is one of those games that makes me think: When people constantly go on about Nintendo being "kiddy", they forget where the term "Nintendo Hard" came from and just what it means. If they want to make things bloody murderous, chances are, it's going to be way harder than most other things. Watching people that say that stuff actually try games that fit this is usually really hilarious.
EDIT: I'd mentioned being irritated by Ninjara before, and seems I'm not the only one. Apparently much of the community considers him currently broken. Not surprising. I've never seen a fighting game release it's first iteration without a broken character being present. Not even once. Good thing is, Nintendo is already patching the game. They fixed Broken Tactic #1, which was "use Hydras alot" (fist type), so hoping they'll fix Jerkface.