I'm fine with it personally. I get more zetas than I would normally, and I usually just put my good teams on defense which is helpful for the guild but not particularly thrilling playwise.
All things considered, they could have done a lot worse as far as compensation goes. Guaranteed first place rewards for a high GP bracket, for four straight battles, is pretty generous.
Yes, having quests delayed is a bummer, but nobody is getting a chance to pull ahead of you, so it's still a level playing field. If that's the price for a pretty cool new game mode, I'm happy to pay it.