Greetings kawaiigardiner,
http://islamicbookstore.com/b6671.html - Claims that Jews and Christians actually turned into pigs and apes where as most commentators (such as Muhammad Asad) take it to mean having the manners/personal characteristics of them rather than the literal.
I think you need to be careful about saying "most commentators". Muhammad Asad's commentary and translation contains many errors and many views which go against the teachings of the Prophet Muhammad (peace and blessings of Allaah be upon him) and the consensus of Muslim scholars, May Allah (swt) forgive him.
A tafseer should follow the correct principles of explaining the Qur'an. This includes turning to the Qur'an itself as well as the Sunnah for explanation, and there are many other aspects involved. Among the best and most widely known is
Tafseer Ibn Katheer.
Regards.