As I know Yahtzee can always provoke a good discussion in these forums...
During the recent AdventureX adventure games expo, the voice of Yahtzee presented his take on history and evolution of adventure games. Here's the whole thing recorded, available courtesy of the AdventureX organizers:
http://www.youtube.com/watch?v=gpNSlzk80HY
Some interesting opinions/evaluations that got my attention:
- Adventure games are basically all story, no gameplay. Possibly the only game genre without gameplay.
- The idea of adventure games is to extrapolate basic interactivity you can have in games (not only adventure games) - i.e. "use key on door"
- Point & click interfaces are "for babbies" - you can get to the solution by brute force. Text parsers were a much smarter way to play adventure games.