I've never been a huge fan of Stephanie Meyer adaptations on the big screen (have you seen my reviews of the Twilight saga films?) and The Host has not changed that.
This film has Twilight in its DNA (a headstrong yet sensitive female teen, a love triangle, and a supernatural/sci-fi backdrop) but it also has its major flaws (laughable script, shallow plot) raised to the second power. I really want to find the saving grace in this film, and when I say that its the actors (Saoirse Ronan and Max Irons), then this film is really an early contender for a Razzie.
The sci-fi component of this movie is pretty sound (aliens taking over a human body) but making that the core of a teen romance makes it full of awkward and unintentional comedy. Did I mention thatthe running time of the movie is over two hours? Many times I wished the film would fast forward to the syrupy sweet (and predictable) ending.
I can imagine that the only group that would like this film is really the thousands (or even millions) of Meyer's fans who want to see the sequel to The Host. Oh, shudder the thought.