1. The Crucible is WAY more lethal an environment than you are used to playing Halo or BF. High level guardians have about a half dozens different ways of killing you. All of which you need to keep in mind as you decide what fights to pick...and what ones to avoid. 2. You really need to spec your Guardian differently for PvP than you do in PvE. In PvE, Armor and recovery play a big role in how survivable your character is. Whereas the Crucible rewards recovery and agility. 3. Titans excel in close-quarters, where Warlocks and Hunters are more ranged attack characters. So most of the really good Titans you see in the Crucible are armed with autorifles, or HC as primaries...and shotguns or FR as specials...and they're looking to get in the face of their opponents....and their supers can back off the enemy if things get too hot. 4. If you're a high level character (25+) consider Iron Banner. In Iron Banner your level advantages are active...and your attack and armor ratings matter. So as a highlevel player, you don't die from your mistakes quite as fast as in the regular crucible. So you both have time to fight your way out of them at time...and (more importantly) to see what you did wrong and learn from them. I'm loving IB, because I'm seeing mysefl get better with each match in a way that I never saw trying to play the regular Crucible.