Originally Posted by Sorcha Ravenlock
But you won't have more fun at level 10 or 20. When your level goes up, the creatures go up to exactly (or almost exactly) the same level as you. So no matter what level you are, enemies are always an exactly balanced challenge, that you can always handle if you set the difficulty level at the appropriate level for you. All creatures have the same levelled loot, so you will never find any item too high or too low for your level either. Heck, even the shops stock items just right for you. Spooky, isn't it?
So the game plays the same at level 1 or 2 as it does at level 20, and so you can enter the expansion at level 1 or 2 if you want.
At least PC users can download OOO, which seems to solve the levelling problem. (doesn't get rid of the no-choice questlines though).