I think some people are getting a little dramatic with this event. Not every event is going to be perfect for everyone, nor will every event be perfectly executed. That's life. The Demonic Dominance thing isn't working, but it's not the end of the world. The Epic Upgrade may not be a viable task for some people, but come on, you're complaining about Tsume being irrelevant but you also maxed his epic before the event even started? You jumped the gun, and it's a bummer, but it's still not the end of days.
This is a great game, and overall the devs do an amazing job. Provide some objective feedback and go play. Or take your gf or wife or husband to a movie. In a couple of days this event will be over.
All that said, I really like this event. Lots of gold to be had! Thanks @Joel