The damage issue doesn't bother me all that much.  For one, its easy enough to fix it on my own.  For another, I've always thought that the math was a bit fluid anyway when you started to consider additional effects on the power.  How many points of damage is dazed worth?  Immobilized?  -2 to attacks?  -2 to defense?  Vulnerable?  etc., etc.  
 
I will concede that it would have been nice, but just isn't that big of a deal to me.  Of course, I've been using the original Monster Builder all this time and have grown used to changing the numbers so its also probably a part of the reason why it hasn't bothered me too much.
 
Being able to export is a different issue.  I have to agree that it is a bit of a letdown that there isn't a better export function (even though I personally would not use it very often).  
 
All that being said, I do think that it is pretty slick now.  Its particularly easy to take powers/traits/etc. from one monster and add them to another which is great for themes and/or simply creating new monsters of a certain type (i.e. a new foulspawn).  I realize it could be done on the old builder but it was a lot more cumbersome in my opinion.