>>39465333Honestly I think it was presentation. Generations 1-4 also had simple plots but their characters and worlds still stood out more than X/Y. This is subjective, but I think art style, character designs, and writing were all weaker for the most part.
Also the second half of the game is very squashed together, with you fighting Lysandre 3 times within an hour. Nothing is given time time to stick out and the game feels like a blur. People's fondest memories seem to be of communicating with other players or playing dress up rather than the core game itself.