My first choice would be too depressing. (Score 1)

"Pirates! Gold" is my favorite game of all time, hands down. Unfortunately the depression would be too much for me to bear. No, not the sad irony of sailing the seas, or being deserted and rescued on a daily basis. I'm talking about never being able to consumate my marriage to the governors daughter.

Soo.. "Battle for Wesnoth" get's the nod over other contenders because of open source and scenario editing.