This is quite simple, Here are a list of Nigerian Hip Hop Rap artists listed below.

MI,
Wierd MC,
Rugged Man
El Dee,
Pheyroshous
Sauce Kid,
Mode9,
Zaki Azzay,
Freestyle,
JJC,
2 Shotz
Nigga Raw,
Terry Da Rapman,
Naeto C,
Teeto,
Edris Abdulkareem,
Da Grin,
Lord of Ajasa,
Dr Sid,
OD,
Ikechukukwu,
Ill Bliss,
Elajoe,
Sasha,
Kel,
Bouqui,
Blaze,

I want to sample your own opinion in terms Hierarchy rating of these hip hop rap acts in the following hierarchy's :

1 - Out standing & Tight
2 - Alright
3 - Just There
4-  Outright Wack