If you"know" how to use a Titan they can be the most effective class in PvP. I've reached Rank 5 in Iron Banner the last 3 events using just my titan. I would play Defender with almost maxed Recovery and Armor with almost no Agility. Then I would use Mida Multi Tool, Felwinters Lie and Jolders Hammer. Also would use Armementarium as my Exotic armor while using Armor of Light in my subclass. Come get some Hunters and Warlocks :P