Im more surprised that some people actually didnt like X/Y.
No proper 3D in the overworld, only 70ish new pokemon for people who like to catch them all (a mega isn't new, it's got no pokedex entry and I can't see it in the PC outside battle) and a major step down from black/white in terms of involving gym leaders in the games plot. Back to basics structure that meant it felt the least new of any new gen since 2.
If you aren't in it for the PvP it's an easy game to be disappointed by.
I should say I still liked it but it was disappointing.