My main problem with the Nokia 6 is that for the first Nokia Android smartphone, it really doesn't have anything that differentiate itself from the other mid-range Android phone; it's just another Android phone. In the early 2000s, many people bought Nokia phones because it's innovative hardware and software features, but those days are long gone. Many people remember keep kindness to Nokia for its great Lumia phones and especially its innovative cameras, like the one in the 808 PureView and the 41-megapixel Lumia camera in the Lumia 920. Many people bought Nokia phones for those reasons and back then Nokia really was ahead of the competition, but today it's not.
This is why many users were disappointed to see a phone that although looks nice, doesn't really brings anything new to the table. I probably wouldn't even consider putting it as a disadvantage other phones, but for a brand new Nokia Android phone, there is nothing, other than the brand name that will convince me to get the device. Even the processor is old and there are better alternatives out there in the Chinese market. It's a phone that you probably happy to see coming, but all it does is build up the hype and set high expectations to what's going to come out next, nothing more.
I'm sure that there will be tons of users that will get the phone just to put their hands on a Nokia Android smartphone. This certainly isn't enough, and I do hope that Nokia plans to release more competitive devices.