The old Sierra was such an amazing part of early computer gaming, mainly because nobody knew what genres the industry would eventually end up in. Imagine a single company today that makes games in the following genres:

* Police Investigations * High Fantasy * Fairy Tale Fantasy * Sci-Fi Comedy * Adult Comedy * Arcade Games * Educational Games * Card and Casino Games

* and then had a subsidiary pretty much devoted to 3d Simulation and Action games.

and did all of those, including multiple sequels, in the space of less than 15 years.

The lack of rules also bit Sierra later on as players encountered more games from other creators and we slowly realized how unplayable many of the Sierra games actually were. But for the period where they dominated, they were kind of a wonderland.

Memory: I basically learned how to type playing Police Quest and Space Quest II.