I tried the event. The judgment is mitigated, at least in part, by the fact that the requests and tests are not impossible and by the organization of the same in daily and fixed times.
However, the basic concept remains: the event in fact is not suitable for grepolis.
The rewards prevent the continuation by maintaining the accumulation (typical situation of the events). This eliminates the ability for players to accumulate ingredients for recipes or rewards to be redeemed at the most suitable times. In short, the event forces players to make certain choices in a hurry, penalizing the game strategy.
Moreover, the great variety of mythic units, albeit in small quantities (appreciable note), suggests that it is an event thought and considered for an advanced phase of the game, but in this case the special rewards and those of the tests would be really poor. and almost useless. In an advanced phase of the game of 6 coins of wisdom I do nothing, as well as 1000 wood, while obtaining 9 cerberi or 9 centuaries with extremely simple missions makes the rewards for small accounts with few cities unusable