This is actually a question how you see yourself from someone elses eye. Would you marry YOU if you was someone else? What would be the reason not to marry you.
When i asked this question to myself, i got a lotof self awareness actually and it helped me to be a better person So don't be sad if your answer would be something negative, its in your hands how you want to change your world
but anyways, i think i have plenty of good qualities/traits to offer (of course bad habits and bad characteristics too though, like everyone else) and am husband material.
Like the other person said, at least you are honest. You aren't blind like some other people who will never got a chance to fix their problems because they wont see and accept that its coming from themselves.
So don't be sad if your answer would be something negative, its in your hands how you want to change your world 
