The least attractive places to get for me are...

Inverness - too far from everything.
Oslo - too far from everything.

After that, i'd say it would be all the island provinces such as.. Iraklion and Caligari ..they aren't as usefull to me normally.

Lastly it would have to be the provinces that are far east such as Sarkel.. because they are too far from everything, and unlike the island provinces , you can't use a boat to travel faster