What do you think of these songs?

Nas, Eminem, Kanye, and B.I.G are all good. Anything by Lil Wayne or Drake is **** (In my opinion). Jay Z has some good rhymes here and there. Check out some underground stuff if you're looking for lyrical quality. Doomtree, Immortal Technique, Mos Def, Talib Kweli, or Atmosphere. You're close to it with a few of these but if you listen to some of the artists above then you'll realize how much more hip-hop can be.