Atlanta is awesome. Sorry you had a poor experience
I think Atlanta still suffers, fairly or unfairly (mostly unfairly), from what most would call the "mixed" legacy of the 1996 Olympics. Since most of us only travel your way on business or if we have family living there or in school, this is really the first time the city has been "in our faces" in 20 years.
As for the Olympics, great moments within the venues (Muhammad Ali's lighting the Olympic Flame, Kerri Strug's Vault on a broken leg to win the Team Gold for the US, Michael Johnson) were overshadowed by the tragedy of the bombing, the botched investigation that literally destroyed the life of an innocent man and the perceived "ticky tack" commercialism surrounding the events. That old fraud Juan Antonio Samaranch didn't help matters by dissing Atlanta in his final remarks. It's a toss up in my mind whether the International Olympic Committee or FIFA belong at the top of the Corrupt Sports Organizations list.
That was Atlanta's last walk across the global stage in our lifetimes. Now, the city has returned. The SB is a global event, second only to the UEFA Champions League Championship Game in global viewership, led by around 120 million on average in the US and a difficult to count millions of viewers elsewhere. But, if someone wanted to say that 200 million people will tune in to some or all of the game, I wouldn't argue with them.
Atlanta has quietly and efficiently moved on in the 20 years since those Olympic Games. But, I think that some of the negative images still linger in people's memories.
In some ways, the Olympics seem to have jinxed the city in more ways than one. I believe that the last major professional sports team to win a Championship was the Braves in 1995..a year before the Olympics. So, maybe the city feels that it is time to free itself from its history...but, remember, you are playing against a team based in a city that waited 86 years to win a World Series, after trading Babe Ruth to the Yankees.