Over the years the MMOG genre has evolved and new mechanics have surfaced to help keep the genre interesting. Combat, housing, and flight are just a few innovative mechanics that have helped keep the genre interesting. While some of these mechanics are hotly debated as to whether they are good or bad for a game, few can deny the benefit that many of these features have brought to our genre.
Innovative game mechanics are a rare thing to find these days, but in the past, some developers have brought the MMOG genre forward by creating innovative ways to play a game. Guild mechanics, combat, diplomacy, and a number of other creative features have served to move the genre forward, while some mechanics like instancing remain a hotly debated topic on whether its good or bad for a game. Regardless the opinion, no one can deny what mechanics like this have brought to the genre.