Obviously I'm talking about the OG campaign. Titanfall has added co-op since launch, but I still wouldn't compare it to a traditional FPS campaign.rhetorical question, but have you played The Taken King? Because you saying this clearly shows you don't really know what you're talking about. You read about and maybe even played the old campaign and have no idea how things have changed since then. do your googles.
here's a hint: whatever it is that you mean by "non campaign stuff" is actually all tied to the main campaign. actual non campaign stuff like the Crucible, Iron Banner, and Trials of Osiris have separate maps, mission, and obtainable gear
It's more like horde mode, which is exactly what most of the missions in Destiny are.