Good for Ubisoft - saving $$ and saving trees. Best of both worlds.
You know, I pretty much skim through most manuals, these days - most manuals seem to be a waste, anyways. And if I buy a game from Steam and it has a PDF manual, I likely won't read it. Though, some games - normally say RPG's - I go through the paper manual or PDF manual quite a bit.
In the old days - the manual was there to give the player what they could NOT get in-game. As more games give you the story and controls in-game - do we really need manuals anymore?
As long as the game teaches you somehow how to play in-game as you're playing - like in a separate tutorial mode to learn how to play (older games did this; not so much true these days); a tutorial level in a game (opening level of many games); or the game tells you how to do things as you learn new gameplay mechanics slowly as they get unvealed to you (GTA4); or you can just go to the controls and remap them to your liking - so be it.