The 10-22 is the only one of my lenses that never gets used with the hood. Why? Because the hood is too large and too small. Let me explain....
It's too large because it's too wide. It takes up an inordinate amount of room in my bag and, if I have it on the lens reversed, the lens just doesn't fit into any of the compartments in the bag, or any of my lens pouches. I'd find a way to carry it around if it weren't for....
It's too small, in that it's not deep enough to do the job of a hood. It's not going to do much to prevent impacts to the front element and it's not going to block much direct sunlight hitting the lens. Besides, even without the hood, shooting directly into the sun, this lens just doesn't produce any flare (well, it does if you add a 'protective' filter).
So the hood is a pain to carry around and doesn't really do anything useful when it's fitted - which is why it's been stuck at home since I bought it.