You have nothing to base your opinion on. One of the best ever? No. Maybe one of the most succesful, yes .. but he is far from the best. A lot of his success is due to the hype surrounding him and the way he's marketted, how can you not see that ? His recent appearence's on collab's and such have been sub par, the Can-I-Bitch track was probably his worst attempt to date and the upcoming D-12 track that leaked was weak even by their standards.