"He died something like 10 times in 30 mins, and i'm really happy of that, probably he had to understand a little how the system works before try to be an hero."
I feel you ! But what I mean is that it feels (to me) a little bit like "how the system works" is about "where I need to go at this level". I'm not sayin that build, strategy and roleplay are not the most important mechanics in this game (otherwise it won't be a game for me), I was just thinking maybe taking that much time for just finding the good place for your level is not a wanted mechanic for the game.
And I confirm I did DOS1 twice and every time I needed the level map from the beginning... and didn't need it for DOS2 act1 ... but I may be a casual gamer at heart ^^ (no offense taken)