Changing pve structure

I'm not saying I hate it. But after finishing my first 22 strike. They really need to change up the whole boss mechanics. The hard part is the adds. But after facing the ogre "at world's end" or whatever. You run around like crazy killing wizards and knights dodging exploding creatures avoiding the machine gun eye bday from the ogre. But one the waves were done. We sat there for ten minutes widdling down the last 50 percent of his health for like seven minutes. It was simple and boring. We ran out of ammo and ended up purposely dying to come back with ammo from a revive. Maybe add some armor you can knock off to make them more vulnerable?