I'm willing to bet that people who's first Macbook Pro ever was the 2016+ will generally be happier with the purchase and have fewer complaints. The newer laptops are still generally better than what those users had before which were probably crappy Acer laptops.
For those who came from the 2012-2015 Macbook Pro Retinas, they generally dislike the newer laptops. The 2012-2015 laptops were less expensive, more ergonomic, more reliable, and had better battery life. I'm in this camp.
I had a 2013 15-inch retina MacBook Pro and now I have a 2016 13-inch MacBook Pro with Touch Bar. Both are great. I actually prefer the new model.
When Apple released the Retina MacBook Pro, it was a killer, it was thinner and lighter, had an SSD instead of an HD, and had a much better screen. Still, there were lots of complaints of people who were not happy with it. The prices were higher, they lacked some legacy ports, they lacked an optical disk drive, they had a shorter key travel on the keyboard, they had a non-replaceable battery, and were not upgradeable after purchase. And they were more expensive. Some people even complained about the screen, claiming that the non-retina one was better for photo editing.
I thought the Retina MacBook Pro was worth the price, and that the retina screen and the thinner and lighter package, together with the SSD out of the box, were everything a laptop should have at the time.
When Apple released the new MacBook Pro with Touch Bar, it was also met with mixed feelings. It is thinner and lighter, it has a brighter screen, better audio, a larger trackpad, Touch ID, and it has the Touch Bar.
While there are some improvements, my feeling is that Apple crossed the line too soon and delivered an upgrade with not-so-obvious advantages. I have to say that I like the fact that it is thinner and lighter, it helps a lot carrying around. The brighter screen and better audio are also a plus. I could perfectly live without Touch ID, even though it is nice to have. The TouchBar is fine, but not really useful, I expected so much more out of it. The larger trackpad is good, but not really necessary. I like the keyboard better than the previous one actually (and also the clicks), but I suppose not everybody is a fan. The lack of other ports other than Thunderbolt is of course of a minus; the only USB-C device that I have is a dongle which allows me to connect the Mac to other devices. Still, it does not bother me a lot, as the Thunderbolt connection is fast enough to plug a USB hub to the USB-C connection and have several USB-A ports instead. The battery is smaller, and the battery life suffers a little bit (also because of the TouchBar), but I can live with that.
Overall, I think the new MacBook Pro is an upgrade over the previous model, but, for the most part, the changes were not really necessary. It was not half as great as the upgrade from the unibody MacBook Pro to the Retina MacBook Pro.
The thing that concerns me more is the price. Apple is charging really high prices for all these features nobody really asked for. I live in Brazil, which has very high taxes over products, and Apple manages to basically price the Mac out of the market here. The cheapest Apple laptop, among those of the new batch, here is the Retina MacBook Air, and the most basic one will cost USD 2,700. A maxed-out 15-inch MacBook Pro will cost some USD 15,500. In a country where the GDP per capita is lower than USD 10,000 a year, that is a lot of money. There are only very few people with a specimen of the new MacBook line, and all of them bought it during trips to the U.S. Still, being so expensive in a poor country, these are rare items are really desired, and a target for thieves. It is risky to go around on the streets with one of these. Apple is definitely on the verge of alienating a whole country here, not that it really cares... but I will definitely abandon ship if this policy of raising prices goes on.