Comparing prospects to more familiar college or NFL players is always fun. It helps the reader get clearer picture of the player. Recruiting fans won't see every prospect play, so the can only go by what they read or hear.
The key to making such comparisons meaningful, however, is to not be generic. Just because a prospect plays defensive tackle does not mean he automatically compares to Ndamukong Suh.
The nation's top defensive tackle actually compares to an NFL rookie. A great nose tackle prospect resembles a former star at Alabama who now plays in the AFC East. Also, a 'tweener defensive line prospect from Louisiana should study a defensive tackle who plays in the NFC North.