From the PlanetXbox360.com feature editorial:
"These days there aren't many game experiences that you can't get on either a console or a PC. The only thing that hasn't managed to cross system lines up until now is the MMO genre. It's been attempted once or twice, most notably with Final Fantasy 11, but it has never caught-fire and become hugely successful – as it is on the PC side of things. There is millions of dollars in the MMO genre and developers everywhere are scrambling to figure out a way to create the first big-time MMO for the Xbox 360 or Playstation 3. To be honest, I can't see it ever working in the console space as things stand now, and here are the top 5 reasons why."