Fame - I was not aware of your personal loss. Your candor is very much appreciated.
We have a complex legal system that is far from flawless. From our current U.S. laws, drunk driving is much less severe than murder. But from a moral perspective, they are closely integrated. But I would say that drunk driving is not the same as first degree murder.
The primary distinction is (for me) intent. Drunk driving is despicable and reckless, but does not have the premeditated intent of first-degree murder.
If I were a judge, all convicted drunk drivers who injured someone else should go to prison for a minimum 10 years. The severity of the injury would increase the term accordingly. A drunk driver who killed another person would receive a mandatory 50 yr sentence with no chance of parole. Murderers should either receive life w/out parole or the death penalty