what would you classify as A,B,C,&D neighborhoods of Atlanta?

[Robert Collins]

what would you classify as A,B,C,&D neighborhoods of Atlanta & Surrounding areas ? 

I’m trying to learn my areas and I figure I would ask bp to correct me if I’m off, I assume Buckhead would be a A class 

Smyrna B class , C class would be , 30331 area , & bluff area/ vine city D class ? ( even though it’s transitioning) but I’m new to this so I need some help trying to figure out if I totally got this the wrong way. 

[Trey Knight]

A class Roswell, Alpharetta, Vinings, West Paces, Buckhead, North Druid Hills

B class Midtown, Inman Park, Howell Mill, Grant Park, Glenwood Park, Cabbagetown, Decatur mainly Ponce

C class East Lake, Castleberry Hill, East Atlanta, Memorial, Parts of Decatur, Almost anything on the belt line would be B-C

D class West End, East Point, College Park Downtown?, south of East Atlanta like Constitution rd

E class Bluffs, parts of West End 

Most potential I see right now is around Tyler Perry Studios