The Oktoberfest gets worse every year, people from munich are the biggest Saupreißn anyways, but it just gets worse - more arrogant, funky people, destroying the original view on Münchner - you can see this on the musical "hits" Michael mentioned, none of them really traditional bavarian like "A toter Fisch im Wasser" for example.
Most munichs I know dont go the the Oktoberfest anymore because they dont feel at home, it was much better 10-15 years ago. Now its some kind of multi-international Springbreak or something, if you really want to get to know the original bavarian Fest tradition go the some other smaller "Bierfest" in the wide area around munich. (Not the Rosenheimer Herbstfest, each year it gets more like the Oktoberfest, but not as bad yet).
Not to speak of the cost explosion, wth?
The true bavarian