Really nice, lively discussion, and important questions to considered in light of digital archiving.
I get the hesitancy to throw any and all games made by minor subsidiaries on the list with our beloved “Sierra Family”. I think there should be a place, however, for acknowledging the presence of these games and the work of these subsidiaries as part of the Sierra Corporation–ultimately Sierra benefited from the profits of these games, and those profits made the company more valuable, thus better able to produce more games.
An interesting way of thinking about it might be to ask, “If we don’t archive Half-Life, who does?” Are there people out there doing similar achival and commemorative work for the games of that subsidiary? Is it possible to provide historical and visual info about the game while acknowledging its problem in terms of ownership (problems which only seem to increase as games and game companies become increasingly investing in heavily capital-based entertainment markets)?