I don't mind more heroes. You won't be able to max all heroes in a typical world anyway, so you have to make some choice on who to level up when, and it's always the usual suspects anyway.
I just think they should have released a hero with a unique ability instead of having a third hero to power up hops. For example, a hero that decreases the cost of catapults or makes them more effective, or one that decreases the cost of mythical units. Even if Ajax is better than either of those heroes, it's something different
Having them do different things is fine, but we are getting into the area where there are multiple heroes for one thing, for example:
1 - Aristotle, Daidalos, Eurybia, Pariphaistes - all boat makers, there could be just one hero to make all boats, they do not have to be specific to each type. What is next, a hero to build Fast or Slow Transports faster?
2 - Agamemnon, Hector, Medea, Pelops, Telemachos, Themistokles - all boosts to Defense/Offense troops, most giving boosts to two different types of troops. Could cut this down to 2 Heroes, 1 for Offense, and 1 for Defense.
3 - Chiron, Odysseus, Ferkyon - Ferkyon does all troops, the other two are not necessary.
4 - Andromeda, Rekonos, Terylea, Ylestres - all resource boosters, Andromeda is sufficient, though I will admit I do like Terylea with the silver boost to fill caves quickly.
Putting this many heroes in the game makes it way too easy to have huge boosts in multiple cities. Half of these could be cut out.
You could easily have a nice variety without over doing it.
Boats Speed boost
Boats Speed Build boost
Defense Troops boost
Defense/Offense Troops Build boost - Ferkyon
Myth Defense/Offense boost - Urephon
Offense Troops boost
Resources boost
Boats Defense/Offense boost - Zuretha
Troop Movement boost - Atalanta
And then your miscellaneous ones along with those. There does not have to be a hero in every city, make the player pick and choose out of their cities instead of letting them have so many they don't have enough cities to put them all in! We do not need to be spoiled like this with all this selection, some of us played without them and did just fine years ago!