In case other people have this problem and/or the OP is not fake (as choppy suggested), I'll say this:
I often feel the same way. It's not about being spoiled by good games and finding other ones inferior. It's about losing interest after a while.
My whole problem with games is that they have to be interesting enough to keep my interest for the amount of time I'm playing. If I'm playing an RPG, that RPG has to keep my interest for its full duration on top of being more interesting than any other game I might feel like playing instead. That's not me having high standards, that's me having a problem with wanting to continue playing games. Usually what happens is that I'll dump something like 10-30 hours into a game depending on its genre and if it's actually worth playing. After that, I lose my enthusiasm, even if I think the game is amazing and that I'd recommend it to everyone. I keep the game installed because I know it's a great game and I really should finish that, but my heart's just not in it. Eventually, maybe after a month, I give it another shot to finish or I decide that I'll likely never play it again and uninstall it, hoping that one day in the future I'll look back and go "Yeah! I want to finish that!"
Right now I'm in a lull playing Xenoblade Chronicles, and it is the best-designed RPG I've ever played. It has so much for all sorts of different players. It has depth in places most people wouldn't even look or care. The mechanics are solid. The story is great. It's keeping me in suspense.
Despite that, I recently reinstalled Darksiders II and I'm playing that instead. My enthusiasm just isn't there despite it being such an amazing game. However, unlike Darksiders II, I probably won't take a year (or more) break from it because it's that good. I just don't know when I'll feel like playing it again, especially since my interest in Darksiders II will probably wane soon and I'm pre-empting that by starting up the redownload/reinstall of Assassin's Creed Revelations that I also didn't finish (also in preparation for playing ACIII which I recently got on sale). I'm also eying up SPAZ since I'm on the home stretch to finish that game, but I doubt I'll play it again any day soon.
It's a cycle, and when you're interested in as many different genres as I am and live where there are so few things to do like I do, the cycle is to switch out different games until you beat one, mark it off your list, and go with another game.