Parts of the story were shaky. The Ron arriving on the scene was a little contrived, but also completely contrived by Snape. So I think you lot are wrong there. You can not blame the author for Snape's work.
The exciting bits were a little short. However, action tends to be quick and the kids really had to rush before Tom Riddle arrived.
As somebody else has pointed out already, many of you seem to have missed the whole point about the Hallows. Harry did not become a Hallow Quester. He did not seek the power the Hallows 'supposedly' contained. 'Supposed' being the key word.
The epilogue was quite clearly JK's way of silencing calls for an 8th book. It was also a ploy by her to stop herself from writing an 8th book.
I enjoyed the book a lot. Particularly the transformation of Neville, the redemption of Snape and Hagrid's Harry Potter party right in the middle of the war. Got to love Hagrid!!
There were some loose ends, but life is filled with loose ends.