Ron,
The closest domestic meat to deer is goat. Both are browsers, usually eating twigs & weeds instead of just grass like most rudiments.
As already stated, taste will vary with their diet. The best & mildest deer is from a rich green environment as opposed to sage or desert country.
The fat of a deer is white & hard when cooled. It is closer to wax than most animal fat & when left on the meat, will coat your mouth. Also, if the deer is into any noxious weeds, the most flavor will de held in the fat. A plus side is deer tallow mixed half & half with bees wax makes a great lube for cast bullets.
Many associate a strong or gamey taste in deer meat with the fall rut. I believe it has more to do with the green preferred food of summer being harder to find & they switch to a survival diet of evergreen twigs or sage.
To judge the quality of any meat, the best tool is your nose, If it stinks, you probably won't like to eat it, no matter how it is seasoned. To produce good food, you gotta start with good product! Second test of meat is feel, if it develops a slimy feel, that is usually surface bacteria such as coliform. Best to not risk illness with meat that is in doubt, especially someone else's harvest.
Properly cared for, deer (venison) is a rare culinary treat, as good as they taste, it's a wonder there are any left
