Best and most varied maps, best cast with the most interesting and distinct fighting styles, Haruka idol minigame for fags such as myself, Baseball minigame for dudebros
It really has something for everyone, provided you played everything up to that point and know whats going on. Real shame 6 just said fuck it and threw that all away, opting for slightly better graphics but with much worse combat. Don't even get me started on the RPG garbage that followed