Listening Post: AC/DC ranking

How does the band from down under fare according to Septenary?

Back in Black: A+ (100)
Let There Be Rock: A (97)
Powerage: A (96)
Highway to Hell: B+ (89)
Black Ice: B+ (89)
High Voltage: B (86)
Dirty Deeds Done Dirt Cheap: B (86)
The Razor’s Edge: C+ (78)
For Those About to Rock: C (75)
Ballbreaker: C (75)
Stiff Upper Lip: C (75)
Flick of the Switch: D+ (68)
Blow Up Your Video: D+ (67)
Fly on the Wall: D- (63)

AC/DC Average grade: B- (81)
Not that surprising. The post Back in Black output is just god awful.