Whether you choose to buy or not buy the game will be up to you.  I think what's impressed me the most about BD is when I started playing it, I had no idea what 'lie' ahead.  Not an inkling.  And I played DD (and loved it, btw).  I've had the game for over a week now and up until 2 days ago, I was one frustrated gamer.  I could not make it through the first act's dungeon to save my (or my character's) life.  So, like any good adventurer, I restarted.  Lo' and behold, I slowed down the pace, found a couple of things I had over looked (one being a huge treasure chest), and two clicks later, I was back in the universe I knew as DD!  And it was even better than DD.  
Yeah, there are a lot of complaints in these forums.  I like to decide things for myself.  I'm not one to even listen to movie critics and their reviews.  (Why bother? They don't have my particular tastes, do they?   <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />)
So, if you buy the game, I hope you find the same enjoyment and surprises that I have.  
Faralas <img src="/ubbthreads/images/graemlins/mage.gif" alt="" />