This post has been published with the permission of Azgeon, which is the screen name of a user u/exmertiuz. This tier list was made keeping in mind how many resources can a PvE team make over time.
Ranking of PvE heroes is a difficult task, mainly because each of them is good at some things that others are not.
A few more floors that have been cleared in Aspen will not make much difference as clearing the third stage in the broken space. without damage heroes, support heroes will not come to your aid. (Having a 3x support hero and a 3x Damage hero is considered as a good balance).