As someone who plays all three classes I can say this with confidence. Warlocks: Great introductary class, does well in both PVP and PVE but doesn't particularly excel in either. Titans: Always good to have one on your team, if you're a coordinated group that Bubble could very well save everyone on the team, plus weapons of light. Hunters: This is a PVP dominant class, anyone who runs into Golden Gun or Blade Dancer can confirm this. Also they are one of the most important classes in the raid right now since their agility is the highest which allows them to get in and out quick, plus being able to go invisible is a huge help.