I dunno... i've seen that Note 7 ad with Christoph Waltz quite a few times already (granted, it is a US-centric ad)... and plenty of ads online. There's no lack of marketing for this phone.
As for the overal situation... well, there are a MILLION moving parts, including one that hasn't been all the well talked about... The tick-tock nature of phone upgrades. Due to a number of reasons, people are on a 18 to 24 month upgrade schedule, and this has a significant impact on phone sales. With the S line, Samsung sold so many S3s that it had a significant impact on the S4... S5 sold, S6 didn't.. S7 sold a TON, etc. Sure, there are other factors, but this is one of the most critical.
Now, the Note line... while it came into its own with the Note 3, it was the Note 4 that was the most success. So irrespective of the overal quality of the Note 5 (contrary to popular belief, it was an excellent phone), the 5 arrived on the market in a huge disadvantage because the so many of the Note's targent audience had a less-than-a-year old Note 4 in their hands. Other than phones breaking, there are really only two reasons people upgrade; time and features. Either a phone is so old that it needs to be chucked or the new one offers so many new features that the user is compelled to switch. As good as the Note 5 was, it satisfied neither side.
So here we are, two years removed with a bunch of Note 4 people looking for a replacement.... combine that with a phone that is really the culmination of two years or development in the new design language that started with the S6... you get the makings of a successful launch.