I would use the crock pot for your venison roast. Add 2 cups of beef broth, 1 cut up onion, 1/2 teaspoon oregano and black pepper. or, you may use 2 cups water and 1 envelope onion soup mix. The oregano takes away any gamy taste.

It's been awhile since I fixed a venison roast but remember that I used a baking bag. Season the roast with greek seasoning and put strips of bacon over the top of the roast. Place in baking bag and bake at 325 degrees or lower until a fork will easily pierce the meat. Slower baking temp seems to make for more tender meat. This makes good chopped barbacue if after baking you chop and add you favorite sauce.
Good luck!