Greek hoplites are one of the best units in the game in terms of overall usefulness and cost-effectiveness for what they offer, if not the best unit on these terms.

Hoplites have a great defense, excelent morale, being able to sap, bonus against cavalry, and a good charge bonus (6). It costs 343 of upkeep per 1 unit of 160 men. The Galatian Heavy Spearman, for eg, a unit comparable to the hoplite greek statwise, needs +600 to upkeep.

They are a fine addition to any army, and I cannot simply see their "unfair disadvantage".