Pros: Hanna is an action-packed thriller which shows why Saoirse Ronan is one of the best young
actresses in Hollywood. She is simply brilliant in this film (with her German accent and perfectly stunned expressions when she's shown something her character has never seen). Cate Blanchett is equally amazing as the psychotic Melissa, and Tom Hollander (Beckett from Pirates of the Caribbean) puts on one of the creepiest performances I've ever seen.
Cons: Honestly, I thought the soundtrack (by The Chemical Brothers) was lackluster and, at times, overbearing. Half of the background noise involved annoying groaning electronic noises with drum machine rhythms. The film really deserved a better soundtrack.
I also thought that the ending left a lot to be desired. There's a major twist towards the end, but it needed more development in the actual story. Likewise, some of the action involving Bana looked forced.
Overall: The film is entertaining. The plot moves quickly, the characters are fascinating, and the concept is slightly science fictional -- all good things for readers of this blog.