I went to the falcons saints hues night game 2 yrs ago, I wore a blue shirt
Also, there are a lot of homeless around who will "give you directions"....and expect $20. They are quite hostile.
Also, there aren't many good places to drink beforehand nearby, I recommend TacoMac in the CNN center, but get there early, it will be packed.
It's gotten a little better for drinking around The Dome from two years ago. Hudson Grill, Park Bar, Dan Tannas, Stats, Der Biergarden...