Imo the 3 should play together. Titan in front, warlock as a sweeper en Hunter in back for cover. Take your pick and it pretty much explanes what kind of person you are. A grunt who wants to kick ass for an hour or so and doesnt care about his kd, the luitenant with the best overall specs allowing you to be the best you can be, or a lonewolf roaming the streets for some easy pickings.