Additional episodic content can keep a game worth playing.
Episodes for GTAIV fill the gap until GTA5.
Episodic support for Fallout 3 has been excellent, with each new expansion pack being essentially a new game.
Half Life 2 episodes are what's keeping "Half Life 3" out of a ten year plus development pipeline (of course when you take three years to deliver an episode, you're starting to miss the point of "shorter turnaround time" that make episodic content work).
Music games are better off with a back catalog to buy extra songs for rather than waiting for compilation disks that may have a bunch of songs you don't want.
RE5 episode packs are like new PSN games that use the RE5 engine. RE5 Gold is a convenient way to pick up the current episodes on one disc.
Valkyria Chronicles has had a few DLC episodes that add to the story of the main game.
It all depends on how DLC support is implemented. Maps and new play modes are probably not the best examples. New skins or in game items that tinker with the balance of a finished game are probably among the worse.







