Tabletop RPG's are in some way or fashion an exercise in creativity. Because of this one will rarely find two groups that play exactly the same way. I have Gm'd for groups using the same system, where half the players were the same and had fairly different interpretations of the rules and play styles.

I love that it is a pasttime where there are people embracing 4e and adopting wholeheartedly and others who never understood why people moved on to 2e. I think that is fun.