He's an acquired taste, but there's TONS of game in his lyrics, and he really has taken flows to another level, which accounts for his unorthodox style. His content isn't just game related, but day to day life applicable as well. I can see why most people can't get into his music, but there is good reason that he is known as your favorite rapper's, favorite rapper.
Here's a few of his more socially conscious tracks that are probably easier to digest for someone that isn't necessarily sold on him as an artist. Pay more attention to the content initially, if you can get into him after this, you'll probably begin to appreciate what he does with his flow more after a few spins.
He's one of the few rappers that have always reported from a well rounded perspective and never deviated from this path, and I've always respected him for that.