All 3 The Hobbit movies are great, the Desolation of Smaug probably being the best. But if you haven't watch the first one, watch that first. It ain't The Lord of the Rings, nothing can beat that, but they're still great movies.
None of the hobbit movies are good, and it has nothing to do with them not following the book. Peter Jackson hasn't made a good film since Return of the King. They're full of bad, cartoony action, terrible pacing and crap dialogue.
It was decent. I think it was the worst of the 3 Hobbit movies, but that's just my opinion.
Smaug was decimated? Oh man I've been away too long. Gandolf is going to be pissed, I knew I shouldn't of taken that left turn at Albuquerque, stupid GPS always recalculating route, no wonder I got lost...