The core mechanics of Pokemon are still intact, so depending on how much of your enjoyment of Pokemon comes from that is how much you'll enjoy it.
Everything beyond that is mediocre to bad. Practically no story, horrible handholding, every route and town is lifeless window dressing with nothing to do, exploration outside of the wild area doesn't exist because it is completely linear (the only cave in the game has the complexity of X/Y's Route 1), the online features are a step down even from Diamond & Pearl (no GTS) and then borderline non-functional on top of that, difficulty is non-existent until the champion (and only then, if you've skipped every optional trainer and rushed through with only the starter), performance problems out of the wazoo in the wild area (and the game ain't even much of a looker to start with).