We're an elk ranch, so using elk roasts instead of deer. But, I've got to believe my wife's recipe would work for deer too. And, it's very easy.
Put the roast in a roasting pot
Add a large can of cream of mushroom soup
Add a large can of chicken broth
Back in the oven at 350 for a few hours until it's done
It makes a very nice gravy from the broth and soup. And, the roast comes out very moist and fork tender.