Also striker and sunbreaker are good and powerful classes, the defender class is king in PvE. In KF my group normally runs two or three defender titans at a time, because it makes it easy, especially at Oryx. Through down two bubbles, one weapons and one blessings and those Ogres melt. Throw down another blessings of light inside the shade room and you can actually use your malice in there or over shield if you are running low on health. Truthfully I don't really blame them for kicking you, it sucks but you don't have the most versatile class unlocked for the titan which they could use in a pinch... Just saying.