well, i have been listening to rap/hip-hop for 13 years. i'm very well aware of the fact that guys will use lines from other artists/songs. but to me, it's usually very obvious and i never saw it as necessarily a bad thing.
but when i looked through the list from the first link you posted, i never noticed ANY of that before. and i know all of those songs as well. i mean, that list is really long. the counterpoint article starts using statistics... and anyone knows that statistically, you can spin anything the way you want it to come out.
i guess it's just shocking to see the long list of songs and lyrics, plus the fact that i never noticed any of it before. jigga held me down 10+ summers, i still have love... but damn.