I find it a great thing to do.
Where I come from, we live in front of a national road (don't be impressed by the appelation hehe, it's only 2 lanes wide, 1 in each direction) and cars/trucks travel on it at relatively high speeds (60-70 MPH) and since it's a heaven region for deers and that there are so many, it happens that some are killed by cars.
And since it's not illegal to collect meat off an already dead animal, the hunter that lives next to us often take the good parts off those fresh roadkills. It would be a shame to let such good pieces of meat go to scavengers.
At first I found it a bit unhealthy (without apparent reasons) to eat off freshly dead roadkills, but then again, I think of how the meat that we buy from the grocery store are grown / fed and I realize that a freshly killed deer is much more closer to a gourmet meal-to-be than anything else I could buy at the store !
Cheers,