No, Really: Men Of War
It's time to own Men Of War. I've banged on and on about this for years. I am certain that there are thousands of you who would get a massive kick out of this game who haven't touched it yet. Hell, Kieron and Quinns haven't played it yet, largely on the basis that it's a World War II game. That shouldn't stop anyone. Men Of War is a brilliant, dynamic, inventive, compelling, challenging, intelligent RTS with a thousand features hidden under its hat (which can be shot off, and then picked up and put back on your head). The voice acting is terrible, the tank battles are scintillating. It's now £3.24 on Steam. The slightly less entertaining sequel is bundled with it for £7.49.
Really, just get it, play it. This is worth it for the second level of the original game alone.