Is………This is 2013 and we are playing an MMO.
SAB would be fine as it is if it was a single player game with save points like an original 80’s platform game so the user could play the content over a period of weeks or months and still feel like they are making progress.
Within the context of an MMO however, the mini game is competing with all the other things to do in the game and the time required to complete the world 2 levels, is way too long for most players.
World 1 when it was released was a nice surprising diversion from the main game and the individual zones were just about the right length. As many have commented, Zone 2 (Not done 3 yet) is far too long and could easily be split into 4 or 5 new zones to make playable ‘chunks’ that would be suitable for players who are also wanting to do their dailies etc.
If this is not possible then SAB really needs save points.