First 35-40 minutes I wondered if I what was watching where a parody or the real thing. Script, acting, art direction. nothing really seemed to be for real, I literally laughed out loud a few times. The sight of the animated baby Renesmee almost made me turn of the thing.
I did not turn of the movie though and luckily it grew somewhat as it went on. The last hour was, due to the slightly more interesting (although predictable) script, enjoyable. The acting was still mediocre at its best and the scenery/cgi cheap and childish.
Compared to Breaking dawn, Part 1, I consider this movie to be a masterpiece and it is close to landing a four. However the ending does not speak to me personally at all and I therefore give this movie four stars our of five.