Think about why they stick with you. Like honestly, put your bias opinion down and think about it. Their rhymes stick with you because they are simple, they are not complex, they are not hard to spit or understand. Thats what makes Young Money have no respect from me. A real rapper uses complex lyrics, sick word play and good words.
Now be honest with yourself, think about rappers that you have to listen to over and over again because their flows are complex and thoughtful. Those are good rappers. That seperate good rappers from shitty entertainers.