Pokemon games are what you make of them. You can have some interesting experiences in XY that shake things up a bit like doing regular inverse battles. Also if you accept all of the sky battles you will find a few surprises waiting for you, since your pokemon choices are limited and a lot of non-flying Pokemon can pop out on you which generally have super-effective moves that damage flying types like thunderbolt gengar and stone edge flygon.
I think XY fits the pattern of the previous and subsequent games, and is not necessarily easier. They are all meant to be simple, kid-friendly games. I think its the way that people approach XY that limits their experience of this game more than others because it was sparkly and new and gave away a grab bag full of goodies. I think it was easy for players to overuse some of the tools offered and turn them into crutches. If you find that xy never had any excitement then it may be worth examining how you played the game, and playing it again under a different circumstance.
If you used the experience share for instance you took a short cut through the game. I can understand people doing it, especially the first time around out of curiosity about new features. However, if you made this choice then its not entirely fair to complain that XY is too easy. It's like seizing a 3 mile head start in a relay race, then expressing disappointment about your opponents were to slow to ever catch up with you. The exp share creates an enormous level disparity between you and the NPCs, so no matter how good your opponent's team is you will probably always sweep with Pokemon nearly double their level.
There are a lot of complaints about how easy the rival battles, but if you look at their pokemon objectively they have a lot of solid additions, Slyveon, Goodra, Talonflame, Clefable. Other than Blue or Wally what rivals had way better teams than this with psuedo legendaries and megas? Maybe Silver, but that's about it. They're also generally very fast hard-hitting Pokemon like Mega Absol, Jolteon and Hawlucha.
I personally play this game on set, never use the exp share or o-powers, make a monotype party, fight all of the chatelaines at the battle maison and find that the game is just as entertaining as any.
Some people might be alright speeding through the game in a simple way. No matter which way you play I think still at the end of the day Kalos is a fun place with gorgeous visuals, great Pokemon and cute situations so regardless it can be a nice place to visit. However, if you decide to you want to play with advantages, which XY does offer in the form of o-powers, the experience share, mega-evolutions then I don't think it should be held against the game itself. It was player who decided to lower their own difficulty level.