I love how several in this thread drove through town once and therefore have the lowdown on how dangerous Atlanta is. Look, it's a big city and there are areas of town that do indeed suck, but it's really not bad for the most part as long as you take reasonable precautions. It's certainly not any worse than DC.
Anyway, I've been here since 1989, so here's my two cents.
Traffic: sucks. There's no other way to put it. People haul ass on the highways and are generally pretty agressive. If your friend wants to keep his sanity, he should try to find a place to live either near his job or somewhere where he'll be going against the flow of commuter traffic for the most part. Again, probably not any worse than DC's infamous traffic.
Diversity: Amazing. We have pretty much every ethnic group you can think of well represented down here.
Nightlife/Restaurants/stuff to do: plenty of everything. Everything from wild-ass mardi-gras type party spots to relatively authentic british pubs. We also have some of the best restaurants in the southeast with new ones constantly opening. We have a very good local music/arts scene with lots of venues to see local bands and performers. Most touring groups will come through at some point as well since we're such a big fanbase. It's a one-hour drive to the mountains (great hiking, camping, etc) and about a three-four hour drive to the atlantic or gulf coast. We have all the major sports represented with our pro teams....although they all kinda suck.
Cost of living: not cheap, but also something of a bargain for such a big city. Housing can be absurdly expensive if you want to live in one of the yuppified areas of town, but is reasonable if you live elsewhere. We live just to the east of the city and houses in our area are still under $150k for the most part (and we don't live in the boonies like Bunker does

)
And yes, we do in fact have tons of good-looking women.
