I am not outraged... simply have the explanation.
Easiest explanation... the advertising didn't match what happens in H5.... why... well that is just how 343 rolls sometimes....Bungie did it too, all the time. I don't understand the outrage.
The only truly upsetting thing is they claimed a long campaign when it was the shortest one to date.
In terms of playtime it may be the shortest, unless you take your time to look for the intel, weapon variants, and Easter eggs of course. But, it has the most missions in a FPS Halo game with fifteen playable ones.
Yes, Halo 2 had the same number BUT, one was a cutscene and one was a small tutorial followed by another large cutscene, so really it was only thirteen. Sure, Halo 5 had three missions where you chill and talk but, you still have Easter eggs, intel, and more to find in those missions. Hell, you can turn Meridian Station into a giant game of soccer if you wanted!