If you look at Titan exotics all of them give you a perk from your skill tree, or a perk that benefits you in both game modes. Helm of saint-14 blinds anything that enters the ward of dawn. Helm of inmost light provides death from above and unstoppable. Glass house makes weapons and blessing of light last longer. Those are just some. But other classes have atleast two or three useless exotic pieces. Trust I have all three maxed characters maxed armor.

I agree Helm of saint-14 can be nice. The other two are aboslutley useless. The only good Titan exotics are armentarium, saint-14, ruin wings and very situationally peregrine greaves. Except for Helm of Saint-14 these don't really change the class that much either. Compared to the other classes exotics on the whole Titans are just lack luster. p.s helm on inmost light does not provide unstoppable it provides increased lunge and death from above.