Bungie is terrible at finding the balance between a challenging, rewarding, end-game activity that will give a sense of accomplishment (note: I did NOT say easy) and ridiculously frustrating, beat your head against a wall impossibility to the vast majority of the player base.
Pantheon, Legend Onslaught and Zero Hour alienates and frustrates the VAST MAJORITY of the player base. Its not fun, and that's the second major problem. Games, at the end of the day are suppose to be fun. And constant deaths and wiping and frustration are NOT fun.
Say "get-good" all you want, but if this becomes the rule for future content, there will be a mass exodus of the player-base. I have soooooo many long-time, dedicated friends and clan-mates that hate this and have left the game.
Please, please for the love of God Bungie, please find a better balance between a challenging, end-game content and the very un-fun, soul-crushing, frustrating mess you are currently promoting.
Pantheon, legend onslaught, coil (lots of people complain about that one), zero hour, and raids are content made for a more dedicated player.
Of course it alienates a portion of the playerbase becuase it's not made for them. Not every piece of content is made to be completed by everyone, especially when they simply don't have time or refuse to learn.
I hope bungie sticks to that.