Spoilers after the poster!
I didn't get a chance to re-watch the first two movies. But over my lifetime, I've probably read The Hobbit more than a dozen times. So I remember what is suppose to happen. The Battle of the Five Armies is actually not too off the mark as far as the book goes.
I remember watching the first movie and just loving Thorin. In the book he just seemed like kind of an ass, but Richard Armitage bring so much life to the character. I was sad watching the first movie because I knew what happens.
Thorin and his craziness were spot on. The crazy eyes were especially good. Richard Armitage is an excellent actor.
The 'love' triangle between Killi, Legolas and Tauriel was stupid. Like I said, I don't remember the 2nd movie that much, but did Killi and Tauriel have that much time to 'fall in love'? I remember some jail cell banter but not much else.
But thankfully it didn't take up much time in the movie. I think part of the reason they did it was to make Killi's death all that more tragic. In the book, both Filli and Killi get one line about their death, that basically says they are dead. I think some of the other dwarves should have dead but didn't, but that's a minor thing.
I did spend a lot of the battle, which is a bulk of the movie think 'Where are the eagles? Where the heck are the eagles?" I was really hoping they wouldn't leave the eagles out and count the 2nd orc army as the 5th army. But in the end, Radagast did come with the eagles. And we get to see Beorn dive bomb into the battle while turning into a bear, which was awesome.
In the book, Gandalf goes away and then shows back up at the end. I really loved how they showed what Gandalf was up to - book purists probably didn't but I like it. I found it pretty funny to see Saruman fighting for the side of good.
We get to see the setup for several things going into Lord of the Rings which was interesting. And my favorite part was at the end. Because they actually included the sale of 'dead' Bilbo's things.
I wasn't sure they would include this because they cut out the Scouring of the Shire out of the Return of the King movie. But at the end, was a confused Bilbo and then some confused hobbits because here he was, back from the dead. After it ties everything together - going from young Bilbo to old Bilbo on the day of his 111th Birthday.
It really didn't have a lot of flaws, and it was an excellent movie. I'm happy I got to see it in the theater and I cannot wait to see all six movies in order! That will be an awesome marathon for some weekend!