I tend to like the idea of giant monsters more than I do the actual thing (well, 'actual'), but giant monsters vs giant robots as done by Guillermo del Toro is a solid proposition and Pacific Rim is enjoyable. Also, Rinko Kikuchi who is now officially in everything (this was the third thing I've seen her in over the last few months, the others being 47 Ronin and Kumiko, the Treasure Hunter).
