I am a clan member of an average clan. In CvC we are either in Tier 2 or Tier 3 and we have only two members who have been able to clear one rotation of Doom Tower hard.
Clan view
Depending on the Hydra rotation we are able to clear normal difficulty. Almost none of us is trying hard difficulty.
I would say approximately 70% of all clan members are using their keys on a weekly basis. Roughly ten members are able to get top chest from normal difficulty. Only 3 to 5 members are able to one key normal.
All members using their keys want Mithrala and I doubt anyone will hit Hydra after receiving the last piece of fragment. One member received the final fragment today so I am curious if he will use the Hydra keys or not.
Many clan members are annoyed to do Hydra on weekly basis and some of them are using their keys shortly for reset. I have to emphasize that some clan members hate Hydra.
The rewards are preceived as underwelming by the clan members. Except for Mithrala there is almost no incentive to battle Hydra.
My view
I have to admit that Hydra is real struggle for me. Some weeks ago I was very frustated and was close not to use my keys anymore.
In the meanwhile I slowly (one step forward two steps backward) get better at Hydra. This due to better gearing and also I am getting better to create sucessful and consistent teams. It is really hard to get the proper gear for 18 champions (even more champions if you consider all the rotations).
I have to agree that the rewards for battling Hydra are not great. Hydra is a lot harder but you get better rewards from Demonlord.
At the moment I am unsure, if I will battle Hydra after receiving Mithrala. It could be that I do so, because I need better Stoneskin gear (or getting good Stoneskin gear at all). This is a strong incentive for me and I do now more research on Hydra and what teams can be sucessful.
However, their is one significant drawback. Last week I had an extremly sucessful run with over 21mn damage (normal difficulty). The fight endured almost 30min and it was intensive. If I am imagine that this is the miminum fighting time for higher difficulties than I do not know if should go in that direction. This is a significant time investment and I am unsure, if I have enough spare capacitiy on a weekly basis to do so. For other parts in the game I can use auto-runs, but this is currently no possibility for Hydra. So therefore, I really need to play highly concentrated for a very long time.