I thought it was an absolutely dreadful film. This second movie was two and a half hours long and they covered about 20 pages of the material from the book. The Hobbit just wasn't meant to be a trilogy. LOTR was, it's obvious, they had way too much material to use for the LOTR films and way too little for The Hobbit, and because they don't have enough material they just made up a whole bunch of shit to fill the space between plot points and it's all silly, boring, cgi action scenes that don't have any purpose. That's why they put Legolas in this movie because they didn't have anything else to put in it.
The worst thing they did, the last 40 minutes, utterly pointless, a long, convoluted action scene that does absolutely nothing to advance the story. They have this long stupidly complex plan and by the end of it, nothing has been accomplished.
The biggest problem I had with this movie is that it used very little of the source material, like I said it's about 20 pages in the book. Imagine reading The Hobbit, after a page in, it just stops and there's a 20 minute action scene that was never in the book but at the end of it we pick up exactly where we left off in the book like nothing happened, then you read another two pages and there's another action scene that has nothing to do with the book, then we come back to the material like nothing happened. They just do that over and over and over, and the last part is the worst insult, because it's less than a page, you read the first half, then there is a ridiculous 40 minute action scene and then they get back to the story, and the actions they did in those 40 minutes are pointless, everything still happens the same as it did in the book, they just get the benefit of padding the film out so they can have a trilogy.
It's not that I'm against getting away from the source material, especially because they are throwing whole chunks of The Silmarillion in there, but the battle scenes do nothing for the story, you could edit them out and have a better, tighter plot. It feels like the movie Commando with Arnold Schwarzenegger were the last 40 minutes is just him standing a courtyard with a M60 machine gun shooting hundreds of south americans, it's boring as hell and silly and it got old so fast. Legolas keeps finding new ways of cutting orcs heads off and we know he won't get hurt because it's a prequel, there's no tension and it just goes on and on.