I think a big issue would be if drinking is having a negative impact on your health or your life situation.
I'd respectfully disagree ... why wait until that point?
Wouldn't a better definition be that if you have one drink, you feel on edge or frustrated unless you have another? Or maybe if someone were to drink on their emotions, on their feeling and fears, to give oneself confidence to be able to face situations? I used to drink to wind down, without a drink I'd feel frustrated or wound up in some way, sometimes nothing major, just in my own head.
There are many alcoholics or problem drinkers who function quite normally with regards to jobs, family and house situations, I've met lawyers, doctors, teachers, policeman and many others who are alcoholics. From a personal point of view my health never suffered in the long term, I also never had a DWI and at one point in my many years of alcoholism had a successful business, none of which was a barrier to me being an alcoholic.