Mr.Caine: Isn't discovering everything about the game all by yourself more fun then reading about it?
Try running battlecruiser millenium without the manual, then we'll talk again ^^
* For complex games, the tutorials can be very insufficient. You'll need tha manual to get more detailed info about some subject.
* It's even more important for older, not so popular anymore, games. For those, even finding basic info online about key bindings can be challenging.
* A game manual (older ones, of course, not nowadays pathetic leaflets) often gave you information about the game world, about the story... Without it, you're simply dumped in the middle of a situation you can't understand nor care for.
* Finally, some manuals were directly integrated into the gameplay, as visual aid, info source or hint book (and as nadenitza said, were used as DRM). In fact, it's partof the game! Try playing Police Quest 1 without the "police procedure" manual, or Zak Mc Kracken without the newspaper : Transforms a fun adventure game into a chore.
Sure, many of these info can be googled, sure, but
- The manual gave you the info the author thought you needed, as the author wanted it given. Googled info (or worse, vidéo) is often spoilerific, biased, cold, or all of those.
- The manual informs me about what is in the game. If I don't know the existence of something, I won't google for it.
- A good manual is great to set up the mood (again, Look at Police Quest 1 or Zak Mc Kraken), and simply nice to have around :)
It's of course far less relevant for modern games, where the manual is a puny leaflet anyway and all info is given in tutorial, codex, etc...
EDIT : Another good game manual that I like, and is really NOT optional if you want to play the game properly : King of Dragon Pass