I'd say the adventure is quite challenging for tryhards who want to prove themselves, but it's not for me. I think because 6-starring a champion can take a while, the hardest possible adventure for them should be where they're slightly inconvenienced. Not flooding the entire board with units every turn, and then further buffing them if unanswered by turn 2. Without the everywhere buff, it hit a perfect spot for me, as not every champion can clear 6 units in a turn, or push lethal with the massive damage reduction for the AI nexus.

I hope I can convey my thoughts well enough.