It's not a majority, though it's been worse lately with many of Bungie's dumb decisions. As someone who loved Halo back in the day (cant remember how many times I beat Halo 2 on co-op) I expected a lot more than a grind for loot game which is not how it was sold pre-vanilla. Over time as Bungie's made it clear they had no respect for a players time and tried to keep people playing the same 6 levels 100 times, people started burning out. TDB came out and piss poor communications led to a lot of misinformation and time wasted and the content in it was.....well, pathetic for lack of a better term. HoW made some improvements but actually added very little quality content into the game so everyone was basically max level immediately. TTK hype started and in typical new Bungie fashion, there were a lies in their marketing ("smart" loot system) and once the initial new content feeling started diminishing, the grind becomes even more boring and unbearable. Time-gating content also really set as lot of people off.