Jay-z - Even if ppl like his music or not, no one can say that he has not been one of the most successful rappers that is still alive today.

Nas- well other than oochie walla walla lol his lyrics remain unsurpassed in depth and knowledge, forces the mind to operate.

Eminem- if you think he should not be in the top five, just imagine your fav rapper going toe to toe with him in a cypher, ill bring the body bag.

Andre 3000- lyrical master mind that can/has mixed depth and entertainment on a level that surpasses this dimension.

Dr. Dre- Show me another rapper that made a billion even if it was not from his songs, oh ill wait. Certified musical genius.

Honorable mentions:

Truce- hit that beat yo, "my name is truce, im here to say, im the best rapper in the USA ayyyyyy ohhhhhhh ayyyyyy ohhhh.