It's not. I have played it for around 40 hours, going by my profile, and I can assure you it's a good port. Lots of enemies on the screen, locked 30fps (except during My Room scenes involving baths, for some reason), has every DLC from the Vita/PS4 versions (tho the only DLC was costumes), and has 2 (IIRC) exclusive costumes. The graphics are serviceable, since in the end it's still a souped up Vita game.