Sounds like you joined up with a bunch of jerks. I've ran the raid plenty of time with no Titans. In fact last night I ran a whole team of warlocks (which is supposedly the worst class to use for the raid lol) Yes Having a defender or two would make the raid MUCH easier but it isn't a requirement. I have all three of my classes on each character fully unlocked so this isn't my issue with the raid, my issue is I'm hearing impaired so I don't use a mic and I get booted a lot even though I know how to run the whole raid normal and hard.