I'm not even sure if I was expecting Mockingjay to be any good because I loved The Hunger Games and Catching Fire so much. But I know I wasn't expecting to be so disappointed either. The first two books gave me all the feels and I expected no less from the third. While there were some parts that were redeeming, for the most part, I didn't like Mockingjay.
The best thing about the first books, for me, were the characters. I loved Katniss and fell in love with the boy with the bread, Peeta, with her. I adored her sister Prim and wanted nothing more than to run away with Gale, but Mockingjay was different. While we spend a considerable more time with the main people in her life, I didn't love them the same way.
Maybe the author's writing changed, or maybe because the setting was so different from the first two or maybe it was because Katniss was such a weak character in the third book, but my love for the characters was altered and I just read the book to finish it. It took me a lot longer than the others to get through too. But once I was done, I tossed it to the side and thought "Well that sucked," and moved on to the next book.
So unfortunately my love for The Hunger Games ended there. I still love the first two books but I have to think of them separately from the third which is lame.