Its true the latest version of the MBP has garnered unprecedented levels of criticism, and from what was previously Apple's most staunchest allies and supporters. The 2016 is not a bad computer but its not one that I think that apple missed the mark on in a few areas.
The issues I have with it are the new keyboard and we seem to get a new thread almost daily about some sort of problem with it, whether we're talking some key stopped working, or it leaving a mark on the screen (when closed), or when getting it repaired the machine is worse off.
The ports is another issue, though that's correctable by way of buying more equipment, such as a SD card reader. My problem is after spending close to 3k, for a premium computer and premium experience why should I buy more equipment to get the MBP working the way I need it too
What the new MBP has going for it is a beautiful machine, and I don't discount the fact that its a wonderfully designed laptop, though I do question some of the decisions such as the ginormous track pad and I've see enough posts on that, to know that its palm rejection isn't perfect.
The Dell has a lot going for it, newer processor, upgradable components 4k screen. more ports and a lower cost.
The bottom line is what machine do you feel gives you the most value for your money. I'm not discounting the OS X experience and working within Apple's ecosystem. That's something that definitely gives you value.