It depends on your risk tolerance. Extended warranties are usually not worth it, IMHO, especially since many CC will double the warranty anyway. However, with Applecare I buy it, and it is the only extended warranty I buy, because I use my machine for business and want to ensure I have no unplanned repair costs, access to tech support, and can get it fixed by either dropping it off at an Apple store or sending it in.
I had 2015 and it was a rock solid machine overall, but I had some dead pixels crop up and an issue with the USB port that was covered by Applecare. The thing I like is if I have any problems I can simply walk into an Apple store and get the machine checked and if there is a problem get it fixed; and if Apple has any problems crop up such as the display or keyboard ones that other machines had I don't have to wait for Apple to decide to offer an extended warranty for those issues. My experience, however, is not the norm.