I assume what they mean is instead of a short, debatable quality campaign, with PVE tied in and PVP separate of that, they should just have a long, strong, high quality campaign, with PVP separate and drop PVE. Which would be a lot more like what Halo was, which is what Bungie is great at. I myself would also prefer using a Halo approach to the Destiny franchise, because the PVE I've found pretty stale from the very start, unless they can find a way to really spice it up.
Have you played the game since the last major DLC?
It certainly isn't a linear, Halo-like campaign. But, the PvE is, IMO, the best it has been since launch of the original game.