Why are so many people mad at the Falcons?

The Falcons had a great season but they lost in the playoffs and now a load of people are crawling at of the woodwork saying how overrated they were I mean come on yeah they blew it in the playoffs but jeez why wont people just lay off of them! 13-3 can't be a fluke and even though the Falcons need improvement am I the only one that thinks they can be great?