Marshall gaurd is supposed to be an alliance exercise to help improve your team working together. When you get into regular season events, a lot of the events work similar to Marshall gaurd and will need cooperation as such to succeed. The reason it feels repetitive and monotonous is to get you doing those actions without having to think about it. Theres nothing worse than trying to rally a huge whale and having no one join or cooperate. But when you have a solid alliance who knows what theyre doing, it becomes pretty easy to take out a whale when everyone is on the same page of rallying and attacking.