Yeah man I just made it to the bridge checkpoint with my Defender titan. That one ogre coming from the right is insanely tough, he freakin' ate five gjallarhorn rockets!!! I tossed up my bubble last second and barely made it. I believe the key to damaging these dudes is the raid weapon set, Hunger of Crota, light of the Abyss, etc., with Hive major damage boost (except the sniper, it's apparently broken).