You missed the part
Trust me, I could go on for pages and pages on what's wrong with this...thing.
The crappiness of the sprite art is ultimately subjective, the UI taking up that much space is inevitable when you make a game like this on the iOS. I'll ignore these things. I'll even buy that maybe the screen transitions are important to making the game easier with such an awkward control scheme (though the better choice would've been to not release a game like this on the iOS at all). The achievements are stupid but have no negative effect on the game.
But I can't forgive blatantly lazy things like few animation frames (Even ignoring X's shitty number of animations, look at the way the Crushers move- they compulsively face toward the screen and apparently see X through their robot psychic powers), using the music inappropriately, and blatantly using the shittiest bland default text possible
and make a continuity error along the lines of saying Onimusha takes place in the middle of the Meiji Restoration. Holy phoning it in, batman.
The "lol play the game for you" DLC just adds insult to injury.
EDIT: Oh yeah I'd give the game credit for having good character art for the boss select screen and whatnot, but that stuff is ganked from MH:X so basically anything that was made specifically for this remake was crapola.