This is a very difficult list to write. There were a lot of games that came before World of Warcraft and far too many that came after. Here is the interesting part: the games that came before World of Warcraft shaped what the MMO genre was. Now that it has been over a decade and game companies are starting to develop on a much more reasonable budget, we are starting to see what made these old games great come to life again in new form.
Read more of Garrett Fuller's The List: The Top 5 Pre-WoW MMOs.