I'm not disappointed with the new MBP, I'm disappointed that for the first time in my life 4 years have passed and I can't buy a significantly better machine than my old one. My old MBP has 16gb ram, 256gb SSD, 2.3Ghz quad core (i7). A new MBP would be the same with maybe a slightly faster RAM and a bit faster, but mostly just less hungry CPU architecture.
The GPU is marginally better but there's only so much you can shove in a laptop. Modern GPU monsters are as big as my whole computer.
When I look around for a better laptop (price/performance/weight/battery/everything) I can't find one.
That's what I'm disappointed about.