I marked this post as containing spoilers since I don't know if we consider inter-season changes to be spoilers.
If this show had just stuck to its format of the first three seasons, I would have rated it much higher. After the first one or two seasons, the cast & crew were kicked out of the Canadian diamond minds, and went to Alaska. The following one or two seasons then were good, but steadily went downhill as the the crew moved back to Canada and started moving shipments to small Canadian settlements. Essentially it turned into a drama between two small trucking companies, rather than an interesting reality TV show following the original likable personalities.
If this show had just stuck to its format of the first three seasons, I would have rated it much higher. After the first one or two seasons, the cast & crew were kicked out of the Canadian diamond minds, and went to Alaska. The following one or two seasons then were good, but steadily went downhill as the the crew moved back to Canada and started moving shipments to small Canadian settlements. Essentially it turned into a drama between two small trucking companies, rather than an interesting reality TV show following the original likable personalities.