Well Storm has totally convinced me... if you haven't seen it, check out the Day of Infamy video he's posted in the forums.

I've just bought Insurgency (Day of Infamy is a free mod), and downloading it now. You can buy it here for only 10.99: http://store.steampowered.com/app/222880/

It has the potential to bring back a lot of the soul that Day of Defeat lost after it went Source... (controversial!)