Still, there were quite a few Americans that came into London and failed to live up to the hype.
Some didn't medal and some didn't get the color they were expecting. Either way, they are heading home disappointed after these Games.
So, let's take a look at a few Americans who already counting the days until they compete in Rio.
The Men's U.S. Boxing Program
The United States used to feature the best young boxers in the world.
The program was storied, as athletes like Muhammad Ali, Sugar Ray Leonard and Oscar De La Hoya won Olympic gold wearing the Stars and Stripes.
Heck in 1984, America claimed nine out of the 12 gold across all of the weight classes, winning medals in 11 of the 12 events.
Which brings us to the 2012 edition.
In London, for the first time in history, not a single member of the U.S. men's boxing team won a medal.
This does not reflect well on a sport that's already dying in America. Young athletes choose to play football and basketball instead of boxing, and even MMA has moved past the sport.
Boxing as a whole needs an overall in the United States if the country hopes to turn around this trend in Rio.
It's hard to label a person who won five medals a disappointment, but it's hard not to considering the hype surrounding Lochte heading into the Olympics.
He was supposed to be the next Michael Phelps. Actually, he was supposed to dethrone Phelps, but he failed to do so.
Lochte looked great in his first race—the 400-meter individual medley, where he smashed the field en route to gold—but after that he struggled.
He was caught from behind in the anchor leg of the 4x100-meter freestyle relay, costing America the gold. He also didn't medal in the 200-meter freestyle, where he finished fourth.
In the end, Lochte came away with two golds, two silvers and a bronze in six events. A good result, but not what he wanted to accomplish, as he told USA Today.
"Not really," Lochte said. "Of course, when you're at this level and at the Olympics, you're going for gold. You're not going for bronze or silver. I definitely wanted to medal in every event that I swam; that didn't happen."
He's not done yet though, he'll have another chance to accomplish his goals in Rio. And even better for Lochte, this time around, he won't have to swim against Phelps.
Four years ago in Beijing Lolo Jones fell on the final hurdle, costing her a gold medal.
This time around, she finished fourth. Not a terrible result, especially when you consider she only finished third at the U.S. trials.
However, it's what happened in between that has her labeled as a failure.
Heading into the Olympics, she was a media darling.
Jones was on the front of magazines, billboards and was in more commercials than the Geico gecko. She used her great personality, pretty face and social media savvy to make herself into a star, and I'm not persecuting her for that.
But, with lots of attention comes heavy expectations, and Jones just didn't deliver.
Now, she’s headed back to the track so she can accomplish what's been just out of her reach—an Olympic medal.
She's already confirmed she'll be back in Rio. Hopefully this time, she keeps a low profile and just brings back a medal.
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