The important thing to take away from this article is that MD6 really shouldn't be used in any production software, unfortunately. MD6 didn't even make it past the first round of the SHA-3 competition, so it hasn't received much attention from cryptanalysts.
Cryptohipsters (can I coin this term?) should take a look at Skein (a third-round SHA-3 candidate), BLAKE2 (the successor of a third-round SHA-3 candidate), and Keccak (the SHA-3 winner). These hash functions have undergone much more analysis. Notably, BLAKE2 is faster than MD5 in many cases, but without the security problems of MD5.
Cryptohipsters (can I coin this term?) should take a look at Skein (a third-round SHA-3 candidate), BLAKE2 (the successor of a third-round SHA-3 candidate), and Keccak (the SHA-3 winner). These hash functions have undergone much more analysis. Notably, BLAKE2 is faster than MD5 in many cases, but without the security problems of MD5.