It would have been interesting if they had to leave out the 'Deathly Hallows' although in a way not surprising. It would have non-fans of the books be wondering why it is called the Deathly hallows when that subplot is cut.
I suppose it would end up like the Bourne films - cutting an important storyline simply because they don't have the time!
I kinda understand the reasoning behind the cut of the Battle at hogwarts but then again they are not really repeating because the Battle in HBP is not at all like the final battle. The Battle in HBP is tiny compared to the Final Battle. The Final Battle is gigantic and there is so much to it which i have a feeling will have to be changed - i doubt they'll put all of the Prince's tale in it. The Room of Requirement will be interesting, i'm guessing they'll change it.