Ohhhh.... That is a REALLY good question.... Oh, debate, debate. Even though I get frustrated with his video gaming while I'm there, he enjoys it so I wouldn't change it... I would have to say his money skills. He might have a plan of how to spend his money, but it isn't a very good one. He keeps spending more than he has, which I get upset with. So that's what I would get rid of.
The habit I would most like my partner to cease and desist with is the tendency to criticize with her tone of voice, particularly when I don't do things the way she would do them. Ugh...it grates on my nerves sometimes. (Whatever happened to the old adage, "there's more than one way to skin a cat"? We can't all do things the same way, right?)
I would get rid of his "forgetfullness" if that word exists. He often forgets a lot of things and sometimes important things. But despite that fact, I am very happy with him so I wouldn't mind if I couldn't change that. I still love him and there'll be plenty of time in our lives for us to work on that tiny detail.