http://us.battle.net/d3/en/forum/topic/10497440190#6
In terms of overall experience, rewards, density, and difficulty, we’re working to have Campaign Mode and Adventure Mode be relatively comparable with one another. Even so, we anticipate that most players will probably want to farm Adventure Mode over Campaign Mode, since the open world environment lends itself much better to that kind of playstyle. And, honestly, we think that’s fine.
Campaign Mode is there for players who enjoy playing through the story of Diablo III and having a linear path. Adventure Mode, on the other hand, is there for players who want explore at their own pace. You can freely switch between the two modes whenever you want, so it’s all about what kind of experience you’re looking for at a particular point in time.
And I know I’ve seen this question before, so let me go ahead and answer it now: yes, we believe that players will still want to play through Campaign Mode, even given the option between it and Adventure Mode. We don’t imagine that they’ll replay it nearly as often as Adventure Mode, though; but again…that’s totally okay by us. At its core, Adventure Mode is being designed to be replayed over and over, whereas Campaign Mode is all about the immersion and that singular, linear narrative.
At the moment, players are not actually required to complete the entire game in Campaign Mode before unlocking Adventure Mode. Whether or not it stays that way is another matter, but for the moment we’re allowing you to unlock each Act, one by one. So, complete Act I in Campaign Mode on one of your characters, now you’ve got Act I unlocked in Adventure Mode. Complete Act II on one of your characters in Campaign, boom — Acts I and II are now unlocked in Adventure Mode. And so on. Completing an Act in Campaign Mode would also unlock that Act in Adventure Mode for all your characters on your account, not just the one who completed in Campaign Mode.
We’re still experimenting with this pretty heavily, though, so I’d imagine some changes to be made to how Adventure Mode is accessed before we ship. This is just our current thinking. 🙂
Dynamic Difficulty of Monsters:
http://us.battle.net/d3/en/forum/topic/10497440190#9
Monsters level up with you — we call it “dynamic difficulty” — but I don’t have an answer for you just yet on the specific questions highlighted above (since the new system is still undergoing lots of tuning and tweaking). We’ll be doing a whole “First Look” write-up on the difficulty changes pretty soon here that should help explain everything, though!
