Like the title. What games are made better with mods, and foster a great modding scene that retains momentum and delivers excellent content?
My personal favorite is Fallout: New Vegas, but games like DOOM, Half-Life 2 (really all source engine games), and Minecraft have extremely unique mod scenes. Of course, Skyrim remains a modding titan. STALKER: Anomaly is already an amazing mod project and has mod lists for it like GAMMA.
What are your favorites?
I've only messed around with it versus some ai in single player, I should try and find a good coop server to play on with some people. The AI in BF 2 is kind of pants on head and it detracts from the fun.