Yes, Titans are the most screwed over when it comes to the Crucible. Hunters with both Bladedancer(Aka Lagdancer) and Gunslinger out do us 9 times out of 10. I say us because I also mainly run Titan striker in PvP. Supers.. voidwalker Warlock and striker Titan are on par, blinking hunter and Warlock have us beat(mainly because they spam with shotguns). Grenades, majority are better because they are one hit kills or have burns that do not allow healing. I don't feel I need to add more to this.