I'm not going to list my worst 3 in Atlanta, but the best three IMO are:
1. Peachtree - Great atmosphere, great history, great conditioning, great green complexes and lots of interesting holes over the rolling hills. So much so that you don't really notice that there are very few fairway bunkers...
2. East Lake - This course takes a number of plays to fully appreciate it. As someone above commented, the first time you play here a few of the holes can blur together. But once you really get to know the course you realise how great it is... it's old fashioned (despite the current incarnation being fairly new), and is just a great place to play given the history. I know where many of the holes of the Tom Bendelow course were (which was replaced with the current course when Bob was 15 I think?), and it is amazing to imagine Bob's summer house where the 2nd green now sits, and the stories about a young Bob watching Jim Barnes hitting great shots from the 4th fairway, over a tree to a green where the 4th tee now is, and so on.
Haven't see the changes to the 7th and 17th greens yet, but looking forward to seeing them this week.
3. AAC (highlands) - A good championship course. I disagree with the person above who says this has a 1920s feel to it. The general look and feel is distinctly 1960/1970s. As a result I respect it and enjoy it, but it will never be a course that I love.
Other honorable mentions:
Druid Hills - a great course, but the 15th hole and the 7th hole are absolutely terrible.