Lords of Death Forums Lords of Death Forums LoD FPS/RTS/MMO/Console - Public Game to "prepare" for DF?

Since I'm an MMORPGer, not an FPSer, I figure I should start playing one in order to beef up my twitch skills. Does anyone have any recommendations?

In the #darkfall irc channel, AoCh was mentioned, but you need HL2 to play it. Is it worth paying the $20 to get it? Is there a way to get it for free and connect to servers via Stream?