I agree that rap/hiphop artists are often guilty of just gracelessly slapping a beat over some one else's hook or chorus and it really does come off as lazy and disrespectful. This is especially true when the sample is of something that is (or was) already popular and easily recognizable.

That said, samples can be used in a lot of creative ways and even some very straightforward ones while still creating something unique/transformative. I still think it's a good thing that artists can use samples in their work since it does expand what's possible and I can always just ignore the low effort garbage.