RE: atvs and deer hunting
Here many zones a quad can only be used to retrive game and no weapon is allowed on them for biggame hunting purposes. In certain zones a quad can only be used noon to midnight for transportation for hunting biggame. Other zones it can be used all day in this manner. In the zones that can use a quad as a means of transportation, the firearm/bow must be fully encased while riding. Personally my quad is mostly used to retrive but in some areas (ie: forest) it is the only way to access lands off the beaten path. When I use it in this manner I treat no different than my truck really, parking it and walking to my desired areas. I should mention in these same areas deer is not the main target but rather moose, elk or black bear.
Quads don't cause any problems in the areas I hunt, as I distance myself from the crowd. However some of the popular zones in a open Moose or Elk season I could see them causing some problems on public land and therefore would be more of an issue.