the titans need to be more unique ideas?
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Melee with more reach and or power. A shrapnel grenade. Rockets/Jet packs for the air. Stuff we would imagine real soldiers would use in the future. Since that is what they were portrayed to be. TBH I don't really think the problem is that the Titans are not unique. Its that most of their abilities are outdone or don't work. Catapault, Juggernaut, Flash bang grenade, lack of reach on their melee... Also most of their abilities are about making their supers better (which usually only occur twice on average for pvp). However the other classes have abilities which make them better constantly. For PVE they seem fine.