Unreal Tournament... Unreal Tournament 2003... Unreal Tournament 2004.... Absolute tons of free-shit from Epic and it's community at no charge during 2003/2004 versions...
I have to admit, I'm not really following you....
Quake, Quake2, Quake3, Quake4, Quake Wars (just upgraded for this, so it better be out this year;)).... SOF, SOF2... please god, be a SOF3.... and that's a game that would be perfect for episodic... give me some key missions based on recent world events.... HL, OpFor, BS, HL2 and more than a few of us are waiting eagerly for Ep1...
You could go on forever with this.... Ultima, Warcraft, yada, yada, yada.... if something is good, people want more of it.... IMO, Epic are rank amateurs when it comes to milking a franchise compared to some.
Now the Sims on the other hand....lol;P