It's bloody good fun.
Oh sure, it's easy to pick holes in a story about a weather system that makes it possible for sharks to fly and take to the streets, but that's the whole point of movies like this: fabulous in-home commentary.
Every so often, something comes along that puts a skip in your step, makes your heart flutter, and sets your imagination ablaze with possibility.... If you're really lucky... it'll be a swirling mass of bloodthirsty sharks.
Sharknado is an hour and a half of your life that you'll never get back. And you won't want to.
With few tricks up its sleeve, Sharknado only adds to the list of hysterical Syfy monster-dramas that make for a shamelessly brainless 90 minutes well-spent.
And it happens, and it happens, and it's an awesome, immersive thing.