I believe that the variety of present troops in Sparta: War of Empires is really excellent. I love some units (Spartan Hoplite in particular). Nevertheless I think it is escaped your attention unit: the war chariot. The Iliad tells us that this was much used in the era archaic, and even in the Hellenistic period was much used. There you have ever thought? I know that there are enough units; but you might enter the war chariot as a special unit, available for certain periods, the manner of the Minotaur or the manticore.
We're planning to add new Units, but I'm not sure that the ones you ask.
In addition: why the assassin should be able to destroy the temple of Hermes? It is not enough to kill several units? This is realistically impossible. Only the troops during raids and sieges, should be able to do this.
Because assassins have Offense power.