In terms of mechanics and stuff then yea. They've made EV training and stuff more accessible so battling is more fun than ever before. Also Mega Evolutions are hot.
BUT I still think in terms of designs, music and region Hoenn is still the best. And since the Hoenn remakes are gonna be classed as Gen 6... well then.
Gen 6 has some of the best pokemon designs since Gen 3, and yes, it does have the best online, however, aside from competitive battling, the metagame is ass. Battle Frontier >>>>>>>>>>>>>>> Battle Maison, and believe me, that's not nostalgia talking.
Best online indeed. But Black and White were better story-wise I think, and don't get me started on the crappy endgame wild pokemon content of X and Y.
The ironic thing in this thread is that the X&Y games have many references to the older games. When playing them for the first time I had nothing but nostalgia attacks.