C-Styles
Superstar
I've said it before and i'll say it again:
the difference between Cube/Killer Mike/Pac/Scarface/DMX type dudes and other rappers is that they use skills as a tool to express their views and feelings while a lot of other rappers use their views and feelings as a tool to display skills. In other words, the focus of the song for most rappers is more "I got skills" and that's why you don't feel it as much. the type of rappers i mentioned actually evoke feeling with their music (which in my opinion is actually more impressive than the skills themselves)
EDIT: but if a rapper has the perfect balance between both
I think that the cube/pac/dmx type rappers use their delivery more than lyrical skill to make you feel them, they can say anything and it will sound wayy more than an average rapper. Biggie had BOTH