Spinal:The rap or hip hop you are most likely referring to is the version that's used as light, thoughtless dance or hype music, in which I do agree with you it does suck. However the rap I listen to and the kind that is not widely advertised or promoted has powerful meanings, real trial and tribulation and struggling. Now these aren't the best for high action, adrenaline pumping tricking samplers , but can be used if applied correctly.
Passin' Me By- Pharcyde
Crack- Scarface
Suicide Note- Scarface
Soldier's Story- Scarface
Cool Like That- Digable Planets
C.R.E.A.M.- WuTang Clan
Vintage- Killah Priest
Slaughterhouse- Killah Priest
Celebrate- 8-Ball and MJG
Put The House On It- 8-Ball and MJG
On of these except the 9th can be found on youtube.