Emotionally, I'm not sure if any punishment is ever enough for taking the life of another person if there was a simple way to avoid doing it (like NOT drinking and driving), but I'm glad you at least got a little bit of justice. I had a friend whose 16 year-old daughter was brutally murdered in their home one day (by a friend of one of her sons.) I won't go into a lot of details, but they couldn't charge him with rape (because he didn't have sex with her until she was already dead), but it was an obvious murder; she had been severely beaten and shot in the head, He was convicted and released from prison after only 6 years.
The friend was never able to get over the death, and after being treated for severe depression for almost 30 years, she finally committed suicide. Contrary to popular belief, it was not a selfish act; she fought the desire to do it every day of her life after losing her only daughter. I really believe that in almost every case, the family suffers much more severe consequences of a murder than the person responsible. MOO