Pirates & Raiders is poorly done. The blanket Balkan culture is as poorly thought out as the blanket Eastern culture.
Tylis has a nice enough hybrid roster, but both the Odrysians and Ardiaei got left behind. The Odrysians have no proper spear units, nothing that indicates their Hellenizing during this era. Thracians used the falx as alongside the rhomphaia, so they ought to have the Falxmen, too. Likewise, if Tylis is going to have Gallo-Thracian Infantry, then why would the Odrysians not have something similar? The Ardiaei should have a midtier sword unit, using the sica. The sica is a sword found throughout the Balkans, but the Romans remarked it as a weapon of the Illyrians specifically, so why do they make no use of it?
There is also nothing particularly “piratical” or raid-based about these factions. Like the Nomads, they play no differently from other factions. They get no bonuses to Ambush stance, but it would not matter as the varied stances are overall useless, a flaw of the base-game, where it is better to just attack something than to “raid” the area.
Despite the introduction of “Balkan”/Thracian culture, this pack failed to fix the Bithynian roster (they are a Hellenized group of Thracians, situated in Nicomedia), they are still based on an Eastern template for no reason. The free Getae released alongside this were more fleshed out than Odrysia or Ardiaei.