The problem I had with the Zodiac event is that bears are not part of the zodiac.Well, I really loved last year's zodiac event and loved the bears (except panda) and the time boost dailies. I made good use of time boosts to finish quests quickly to earn more artifacts and time boosts, but there's a practical limit to that. For me, it came down to scouting, completing provinces and CCs to get vision vapor. Once it started to cost more time boosts than I would likely get back, that's when I knew it was time to stop. I was also content with my progress and didn't feel the need to kill myself to get more than 2 leveled brown bears.
The problem for me is adjusting from last year's really good events to this year's lackluster ones. The troop instants were a nice addition, but overall it's hard to get used to something good and then have it taken away. Same deal with tournaments. I spent years building up my ability to go deep into the tournaments and looked forward to continuing that. Hitting a wall of difficulty that may be too difficult to overcome will kill the joy of it.