Let's see here, a lot of this is personal opinion rooted is possible bait. Pokemon X and Y knew exactly who to cater to: Hardcore players and young children. I'm not sure what role you play in the series, but I know you're not the latter.
Now, the steps backward are a bit hit or miss in my book. The game is *not* too easy. In every game, you can go through the elite four the first time with just your starter rather easy with a few full restores and a good moveset. Often that required a specific starter (Greninja is perfect for this role), but whatever. My point is, the games have not been *hard* since I was a kid, but have always provided a decent challenge. The Elite Four in this game weren't jokes, and I had a bit of trouble even with the EXP Share on. I just never grinded. Complaining about the difficulty and overlevelling is akin to crying in the rain.
The story was pretty nonsensical, I'll give you that, but so is stopping a world-wide (may I mention violent) criminal ring with nothing but pokemon battles as, canonically, a TEN YEAR OLD. So is doing it a second time and forcing a very wealthy man to give up being a mob boss and retire Team Rocket. So is two teams battling over expanding the land, or sea when rudimentary common sense says we need both. So is... I'll just stop there. Pokemon stories have never made sense, and they never will.
The lack of end-game content is about the only legitimate complaint I see here, but they made it quick and easy to access so us older players didn't have to wait to get a nostalgia trip. Mewtwo was put there for us. Quick and easy competitive battling was the for us. The remixed and re-tuned versions of distictly memorable songs was there for us. It could have had more content, and if the map was anything to go by, it might have.
The Safari Zone is also incredibly optional. If you want trade fodder, you can find pokemon with HAs in horde battles (the far superior way to EV train BTW) and then you can wonder trade until you get a bred pokemon with an ability you want. I WTed all my breeding rejects with HAs and I got several rejects with similar stories back.
Lastly, that last part concerning the music, that's a personal shtick. It's got beautiful music of the quality that I expect from a pokemon game.
X and Y have a very specific audience, much more so than previous gens. If you're a long term player and you pass this gen up, you'll be doing yourself a disservice. This game is good, and like every other pokemon game before it, well worth the money you'll spend on it. I don't believe it deserves a spot in GYSnB due to the complaints being so nitpicky. Someone even pointed out how this write up could become "Games You Shouldn't Buy because I didn't like them", and I can already see it happening.
This is negative points against your very clean record Ryu. If you were going to even comment on the rushed aspect, you should have mention frame drops in Horde battles. Or the issues we had at the beginning with internet connectivity. Instead you gave very opinionated points that didn't address why the game was bad enough to recommend a pass.
EDIT: I see you did mention the frame drops. Forget I said anything.
EDIT 2: I'll also give you the pacing thing, but I enjoyed that. Grinding the gyms was actually a pain when I was interested in the region. Ironically, R/S/E also had a few dry spells, but I to enjoyed that. Have you thought that perhaps you've merely grown out of the series?