Has he produced anything that has not been successful?

Nop. Obie Trice is a very succesful rapper and so is 50 cent and also D12. All of these artists where produced sa pamamagitan ng Eminem, D12 is a group.

actually his first album infinite was unsuccessful in 1996 but the susunod taon the slim shady ep came out and dr dre heard it the rest is history