I just started a Epirus campaign yesterday. Managed to quickly conquer Pella and Demetrias and then get a ceasefire with Macedon. Then I saw Athens was hardly defended and I conquered it. In the meantime I built stone walls in Taras and I managed to defeat the first Roman army that attacked it in a heroic victory. Cavalery is no good when attacking stone walls
All in all, i'm doing just fine.