But keep in mind that going back on their decisions is not something a network does without reason. I don't think networks should be vilified for a decision reversal since there can be many factors involved behind the scenes such as creative differences or issues during production which may not necessarily be their fault. Networks do not benefit from doing this since they mostly provide bad publicity for the network. That is why these kinds of incidents are very rare in the business.
Moving back to Amazon, I think they may have done worse than the other networks. While the HBO shows already gave their fans some form of closure and the other shows I mentioned were cancelled before airing a single episode, Amazon released their pilots first to generate interest for the shows. They made their viewers excited for more episodes, only to soon leave them disappointed.
Highston's cancellation marks another problem. With only 4 comedies currently on their roster, Highston would have been a part of Amazon's expansion of its comedy brand but it's cancellation makes it look like Amazon has taken two steps forward and one step back with their growth. Fortunately Amazon still has 3 upcoming comedies set to air this year. I hope for their sake that their new shows are successful enough to justify their actions.