I just read a review where the reviewer was whining that Bilbo was not in the movie enough. Did this person not ever read the book and thus not know that Bilbo was unconscious and invisible for most of the battle?.
I can see the complaint inasmuch as Martin Freeman as Bilbo was fantastic and a highlight of the movies in every scene he was in. But yeah, the battle was never really going to be his place to shine...
Overall, I definitely enjoyed the film, and the Hobbit series as a whole. Not as strong as the epic nature of the LotR films, and not as strong an adaptation itself. However, it does fill a solid role as setting the stage for the LotR films, and it had plenty of solid moments and performances. And in some ways, it was able to bring a greater depth of characterization to the dwarves and others who didn't have as much focus brought to them in the book itself.