I finished the last of the three books last night. As they go on you get more of a sense of their target audience (younger crowd - probably why I finished them so quickly) but I still enjoyed them. Probably won't read anything else by Collins though for a while - at least not just because she wrote it.
"Mockingjay" was kind of wierd. It was different from the first two. The end was kind of depressing to be honest and left me with a question that I won't post b/c it's a bit of a spoiler. At one point I had to go back about 5-6 "pages" (Kindle) to figure out what the he!! just happened.
Supposedly, depending on box office all three books will be made into movies but I don't know how well "Mockingjay" will translate. However, if it's got the same actress (Jennifer Lawrence) in it how bad could it really be?
(that feels wrong since the character is supposedly only 17 but the actress is actually somewhere in her 20s I think).
One thing on a Kindle is you don't get a good sense of how long a book is. There is a number at the bottom that tells you where you are but outside of the percentage it is hard to interpret (usually something like 2045/4857 - 4857 whats?)