I have zero sympathy for drunk drivers. Period. There have been enough people killed, and people have had enough education on the dangers of drunk driving to know better than to do it. It's just stupid. The worst part is that the drunk often escapes unharmed, or with only minor injuries, while the person in the other car is seriously injured or killed.
Personally, I'll give someone one pass with a misdemeanor. One. I think anything over that ought to be a felony, unless it's been like, 10 or 15 years. Then, maybe think about a misdemeanor. But more than once, and if the blood-alcohol level was over a certain point, then no. Suspend their license for a minimum of two years, fine them and put their butts in jail for a while. Until people think the penalties are serious, they'll keep drinking and driving.