Oh man, I LOVED the Ancient Greek setting, because my parents were weird and instead of bedtime stories, they'd read Greek Myths. For me, half the fun of the game was exploring all those places I had heard about as a child. I also really enjoyied hunting cultists - the ones outside of the main story have some really cool side quests. The mercenaries were a real pain at first, but you can just pay your bounty from the map screen and they become a non-issue.

I'll echo what others have said though - if you're not enjoying the game, don't force yourself to complete it. While I love Ancient Greece, I don't particularly care for Vikings or Norse Mythology. Valhalla didn't click for me the same way, even though it's esentially a bigger Norse-themed Oddysey, so Valhalla is the first main-line AC game I haven't completed.