I think the linear design of the dungeons right now is a step back from GW1.
I really want all or most future dungeons to have more open design and to give more freedom to the player. Because the 3 paths indeed give a choice, but in the end we still run the one and only possible way through.
Give us more ways to complete the challenges in the alredy chosen path. You did it in GW1, do it again, please.
regards