**SPOILERS BELOW-DON'T READ IF YOU DON'T WANT TO RUIN THE BOOK FOR YOURSELF**
I have to tell you all that I loved the last Harry Potter book. It brings everything to an end so nicely. As for what happened to the characters, here's an article about the online chat J.K. Rowling had to talk about what happened to the characters.
http://www.centredaily.com/living/story/166567.html
In short, Kingsley becomes the Minister of Magic. Harry becomes the head of the Auror department, Ginny was a sports star but is now a journalist. Ron replaces Fred as a partner in the magic shop store with his brother George. Hermione continues to help with social causes through the Ministry.
You might still wonder what happened to the rest of the people, but that's the best part. Books are about imagination and when Harry Potter ends, that is where your imagination should begin. You can then make up a story in your own head as to what happens next to the characters. I think Rowling did a great job of ending the series. Voldemort's death might seem quick to some of you, but if you think about it, it's not. The WHOLE book seven is about his death. The whole journey by Harry, Ron, and Hermione was to find the horcruxes so that that Voldemort can die. If anything, V's death was prolonged waaaay too long.
I love the last fight between Harry and Voldemort. Harry was so certain he would win because he has something that V doesn't have. That's why it did not need to have much action. It's not a Kung Fu movie. They're not going to dodge each other and go flying off the wall. It was the end for Voldemort the moment his snake got killed.