Oh man. I just finished it not more than ten minutes ago. I have to say, I was almost brought to tears (but I have developed an immunity to the shedding of tears over the years). Really really emotional near the ending. I, too, did think it ended a little abruptly. I guess I was just expecting more when Harry and Voldemort finally launched their curses. But, come on, guys, it isn't that easy to end a book at all, especially a fantastic and dramatic series like this. I did think that it seemed a little rushed in parts (one thing unrelated is that the books were in a hurry to be produced, so a lot of them have blemishes and stuff), but you have to give J.K. Rowling credit. She knew what she was doing. Through it all, she still is a tremendous author and writer that really knows her stuff.
Overall, I feel really bad that this incredible series has finally come to a glorious end. I feel ten times worse than when Timpani and Blumiere died/went away at the end of Super Paper Mario. This book was so touching; I could feel everything that happened in the book happening within me. As I type this, I still am suffering from the loss of all of those brave fighters, but yet, reveling in the facts in the last chapters of the book. It's all so hard to describe. I guess my only hope now is that Rowling decides to make an extended epilogue, allowing me to bask in the glory again that is the Harry Potter series.