CIV V Diplomacy is good? It's atrocious and probably the worst aspect of the game next to the combat. As a Civ IV fanatic, I pre-purchased Civ V before it came out. Huge disappointment. Civ IV is the game you need to get. Best game ever.
Honestly, as someone who played FFH extensively years ago, I see no problem in just keeping the name Fallen Enchantress for this series. I know Kael once wanted to make FFH into a stand-alone game, and I think had plans for it at one time. But now Fallen Enchantress is his baby and has many similarities to FFH. Why not just make a future Fallen Enchantress 2 game with FFH in mind. Like Fallen Enchantress: Fall From Heaven. With what I expect is a new engine event