I see what you mean how titan seems to be not really great. I am also a titan and I've played games like halo and other things also. I think its a mix of things. For one thing, its the style of combat. In Destiny you have things like double jump melee finishers and other things which make it somewhat hard to get used to. Also the titan abilities are about equal to those of warlocks and hunters. Hunters have the gunslinger ability which is a one shot pistol and blade dancer which is basically a melee lunging ability. Warlocks have this nova bomb that is like a shoot-able grenade and sunslinger which just gives boosts to all abilities. Titan is left with fist of havoc (striker) which is a powerful ground pound and ward of dawn which creates a defensive shield. To be honest I've been is situations in pve were I had my super charge ability as a striker and needed a super charge ability like gunslinger that was more ranged. What the Titan's strength is armor which in crucible it only gives you like an extra hit from dying at max bar (which is like 9/10 of the bar for armor). I find what really helps in crucible is a few things, one its shoulder charge ability and or juggernaut is really good to just own enemies. Also its supercharge ability either fist of havoc or ward of dawn is really useful in pvp for the control game type, where you can defend a point or go offensive and kill enemies in a point. Titan gives you 2 sides of a coin, offensive or defensive. All classes are equal even it doesn't seem like it, they just have their own strengths and weaknesses.