It’s been a little difficult to find the time and motivation to write recently so posts may be somewhat more infrequent over the next couple of months.
When you say the words “expansion pack” to me, the things that immediately spring to mind are the classic expansion packs in the RPG and strategy genres. Yuri’s Revenge, Throne of Bhaal, Lord of Destruction — it’s a list that stretches on and on. Given the great success of the idea here it’s easy to forget there was once a time when the FPS expansion pack was just as popular, starting with basic Doom WADs and continuing on through the Quake and Half-Life expansion packs to Call of Duty: United Offensive, which was the last really high-profile one. FPSes have since experimented with episodic content and smaller bite-size chunks sold as DLC, but while the RPG/strategy expansion pack concept lives on thanks to the sterling efforts of developers such as Firaxis and Blizzard, first-person shooters have pretty much discarded full-on expansion packs as a decidedly old-school idea.