I’m sick of studying for finals right now so I’m going to take a look at some lyrics sent by the guys over at Mudkids.com. For a link to their song/lyrics visit: http://www.themudkids.com/?p=590
So, what did we learn? First and foremost, YES, they can rhyme. Their rhyme density score of 0.51 is excellent and one of the higher values in the database. Also, a very solid score of 0.94 for NWP. Great rhyming and word dexterity. This is a great foundation to build on.
In terms of word structure however, their syllable per word average of 1.98 is BY FAR the highest in the database. There is no precedant for that kind of SPW average leading to mainstream success (the cutoff is around 1.35). They also average an extremely high syllables per line (16.75) which is difficult to pull off successfully unless you have a flow akin to a Big Pun or Andre 3000.
In terms of line length, they exhibit some interesting patterns. Their End Pairs Even score (% of rhyming couplets within 15% in line length of each other) is only 16%, a much lower value than the 49% most rappers achieve. More deliberate care in making sure line length is more congruent would definitely help.
The types of rhymes they use, at this point, are not very complex. Overall, 25% of their rhymes are perfect rhymes. Most great rhymers hover around the 10% mark. The less perfect you demand your rhymes to be, the more range you give yourself to rap about subjects.
Most of these issues are general concerns with underground artists. This could very well be a conscious decision to sound different and is within their rights as artists to make their unique sound of hip hop. #Shruglife.