I really like how simple Team Skull is. They're just bullies. Good. I hated how crazy the evil teams have gotten. Also you don't have to play all the FF games, most of them don't have connecting stories. But if you want to get cameos and Ester Eggs outta FF15 I recommed playing FF13, F13-2, FF13 Lighting returns and FF14/TYPE ZERO and FF7. They're in the same universe of FF15.