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.