I absolutely love 3D Touch. Yes, it may be a little limited, but its up to developers to make it have good use. WhatsApp for example, hasn't really compelling Quick Actions. Only 'Search' and 'New chat'. Would have loved to see something like a shortcut to your latest conversation. Do use Peek for photos and videos though.
Overall 3D Touch works great. Not only Peek and Pop, and Quick Actions. Also the system based features like the trackpad and the ability to easily switch between apps by force pressing the side. Found myself using the home button less than ever before.
Hopefully, developers are going to take even more advantage of 3D Touch. The good thing however, is that it's already being adopted quickly. Many apps on my iPhone have it as of now. Twitter, Facebook, Instagram, WhatsApp, Pages, Numbers, Keynote, iMovie, Scanner Pro, OV Delay (Dutch transportation app), IMDb and more. Plus of course, many of the default apps. I think adoption is going even faster than last year with Touch ID, am I right or not?
Anyway, like the ad! Apple did a good job on this one.