I don't think there are any objectively terrible D3 locations. No D3s outside of continental USA.
It really depends on who else is in the conference. There are a ton of D3s in New England, NY, PA, VA, OH area. If the conferences are empty, all of those places are fertile recruiting grounds, but a full conference (with the reduced D3 recruiting budget) may make it tough to succeed. Wisconsin is a state with 22 D3 schools (all of the WIAC plus Beloit, Marantha Baptist, Marian, Carroll, Lawrence, Milwaukee Engineering, Wisconsin Lutheran, Northland, Ripon, St. Norbert). If all of those are close to full, there isn't enough recruits to go around, but it's fine in a relatively empty world.
One of the reasons that USA South is traditionally the strongest conference in all of the worlds is because it is the only D3 conference in the GA/FL area. Same with SoCal (only D3 conference in California).