I don't know how to exactly explain it but this Civ/expansion is really doing it for me. It feels like there is less management than in an actual civ game, and its full of unique mechanics that reflect historic scenarios of colonization of the North American continent. The presentation is really nice. The music is spooky because of how well it fits the game. I also like the different interactions with the native peoples. You have options to be "nice" or exploitative, but whichever approach you choose, you still get branching out outcomes that are more than simply "friendly" or "unfriendly". Interations with the european powers are more like civ vs civ in a Civ game. You can employ varous sneaky subversive methods, like trying to arm the tribes that surround our offical ally, then the ally or enemy spends resources fighting them.

Overall, I'd say this is definitely a must play for anybody who liked Civilization IV.