In my experiences, the Warlocks seem to be squishy. I myself, am a Hunter. A few head shots and they were turned into space dust. What I do like about them though, is their ability to recover fast. There was plenty of times when I was one shot away from killing a Warlock and he would run around a corner, come back, and then BOOM....full health and half sheilds

Agreed. I like the Warlock-class, yet after having played all three extensively during the beta I noticed that the Titan suits my play style better then the other two classes. (I initially started out as a Hunter and enjoyed it, but after trying out both Warlock and Titan-classes, the Hunter-class felt like a poorer fit for me.) The Warlock special has the advantage of being capable of being directed before being launched. However, the Titan special makes the Titan invulnerable once the casting is set in to motion. Also, the Titan's higher armor rating was noticeable to me and the way I play. (I tend to favor a mix between picking off targets at a distance before rushing in to get up close and personal, withdrawing if severely wounded and harassing enemy forces from afar until recovered.)