Used to main titan back in Y1. Somewhere in between then and now got onto Hunter. Just went to play Titan today and now I see why I'm still playing Hunter. Seriously, Titans need help. Specifically with their class ability. There was no subclass perk among all the subclasses that dealt specifically with their class ability, the barricade (i.e., Top tree nightstalker: dodge to get invisible, top tree arcstrider, dodge to increase melee range, etc) maybe something like use your barricade and you and your teams shields charge faster while near or behind it. Or you move faster while near it. Or kills from behind barricade or while a barricade is out extend its duration/health pool. Just some ideas.
Just one of many other things I'm sure I'm not even aware of that could be helped for the titans. Again, from a Hunter mains perspective.
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From an actual Hunter main, not a convert: They don't need any help. How they are is how they're supposed to be. Titans both hide behind and defend the city wall. Their role is defense or heavy assault. Not both at once. Warlocks study the city wall. Their role is support. Hunters find their way around the city wall and fight beyond it. Their role is quick hit and run attacks.