I actually think the Defender Titan super is amazing, but not when used as a "this is my safety dome lulz". Oddly enough, my Defender Titan is used best when it's used offensively. Force Barrier activates on kills, and I tend to pop the barrier in a corner where I don't have to worry about getting fired at from long distance, but I can dip in and out of to continue to refresh my Weapons of Light buff.