Bleh... I never really liked playing scenarios. Call me old school, but I like starting on a random map on marathon, in the ancient times with a basic settler and warrior. Plus, I hate scenarios that have different triggers dependent on what you do. Just makes it too scripted.
I'm not the biggest proponent of the different CIV's as DLC, but I would love to buy the following DLC:
1) Cultural unit graphics (make 4-5 variations of each unit based on European, Arabic, Asian, Native American, and Roman-Greek art styles)
2) 10 (at least) NEW units total for all civs (similar to the tons of new units introduced by BTS).
3) A new game MODE, such as "Double-Marathon", where marathon games take twice as long, but have new technologies and units to compensate.
4) A new setting where you could easily create your own CUSTOM civilization without having to learn how to mod. This could involve different sliders/costs, similar to custom civilization creation in the game EMPIRE EARTH.
That be my two cents. What sayeth thee?