I’m not really interested in the mastery system and the season reward events.
But I also have some things which should be done better (basically the same things @Tedt4388 said):
-You should be able to complete multiple challenges in one match.
-No fix order for challenges.
-You should be able to achieve the challenge and then leave the game without not complete the challenge. Especially in matches against the AI. When I achieved a challenge I don’t want necessarily complete the current game.
Instead of the boring mastery system I would rather like something similar like art of war. Were you play multiple matches and they teach you things. This is much more entertaining and the player profits more.
Besides one main reason why mastery is so boring is because of the very bad AI. The AI not just behaviors stupidly. The AI has no character like in AOE3 and Stronghold. In AOE3 and Stronghold it is much more fun to play against AI. Actually my friends and I even mostly played against the AI because it was so much fun. So please developers give the AI character like in AOE3 and Stronghold. For details please see my post about this topic: Please give AI more life