OMG I have an unreasonable amount of love for this movie!
It was just such fun. I can't remember the last time I had a goofy grin on my face for the entire running time of a movie!
Sure, the writing and characterization were "lacking", but the movie was done in the style of all the Godzilla and Harryhausen movies that I loved as a kid. And you can see the love del Toro has for those movies in every frame of this one.
It was awesome watching a little boy walking out with his dad after the movie He was waving his arms around, acting out a specific scene (already described in spoiler tags in this thread), and hopping up and down in his excitement. His Dad was watching him with a happy grin, nodding vigorously.
So. Much. Fun.