I to am of the same opinion whereby the Novelty has DEFINITELY worn off. I've been down here for a year and a half because I wanted to be here. I wanted to learn Castellano, am taking classes three times a week, and had been enjoying my time. But now it seems as though it's a prison sentence.
Unlike a lot of people on this forum, I actually really enjoy the food, enjoy living in the big city, and it's great being an environment where i'm constantly learning things. However, my friendship base is nonexistent, customer service sucks, they picket in the middle of the fcking street during rush hour while police officers look on, electronics/cars are double the cost, I live in a building full of chetos who have 0 respect for anything or anyone, prices are rising faster than the exchange rate, lines are outrageous, everything closes early (and when it rains, they don't even open), Crime is through the roof, and I think I've had it... I, like many, had the preconceived notion that this place was cheap, but it's anything but cheap. That used to be the case when it came to steak and wine, but even those are now going up in price.
Maybe like others on this forum, I need to take a break for a couple months and go back to the US, but I prob wouldn't come back...