I personally thought it was a great game, but needed a lot more fleshing out when it came to the characters and needed to tell the story in a more cohesive and accessible manner. Kingsglaive and Brotherhood are dope, but those shouldn't have been necessary to watch, and I think if you didn't watch either, you missed out on some details. The DLC for Gladio was dope, and you even get some story on Cor.
FFXV hasn't come and gone, that game is incredibly popular in the cosplay community lately, all the girls are cosplaying as either Cindy or Prompto. (They're also collectively busting nuts over Gladio and Ignis... Noct is ironically the least popular but still loved) I guess it depends on where you look, though. The gaming community moved onto Nier, Horizon and Breath of The Wild a few months later, and Persona 5 is the focus right now. It's only natural that XV is gonna lose a bit of attention once the game came out, but it'll come back once Episode Prompto comes out in June.