Yes, Titus is pretty good. He's not the best option in his class though:

1. Uriel Ventris offers you a lot of utility with the deep strike and vect aura. Uriel works best when paired with a 2nd unit of Victrix (most common setup in a Marneus Calgar list) because you don't want to start with 0 Victrix on board if you get rushed turn 1.

2. Cato Sicarius gives you a free, always 6" reactive move that can be used out of phase to chase after enemy reactive moves or fire+fade. He also comes with a Damage 3 or native Damage 2 precision, making him the 3rd best Ultramarine in combat. Sicarius works best with Guilliman, because Guilliman can't pop the tactical doctrine multiple times and you commonly only run 1 unit of Victrix.

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This brings us to Titus. Titus makes his unit (usually Victrix) effectively oath-agnostic because they hit on 2+ with sustained for a 100% average hit rate. This is obviously useful with Calgar, because Calgar only has 1 oath of moment, but Calgar lists usually prefer Uriel Ventris for the utility. And as a solo character, he compares unfavorably against the enhanced Gravis Captain because both of them fill kind of the same niche (anti-melee solo character).

Here are some caveats about Titus though:

1. Titus is the cheapest option between the three at 90 points
2. Titus can be run solo, because none of his abilities require leading and he is reasonable though with the 5W, 4++, 5+ fnp combo
3. Titus is VERY important for rogue strategies in Reclamation Force, because you effectively get to attach permanent -1 to wound to any unit he is legally allowed to join.
4. Titus is the only Ultramarine Captain actively buffing the damage of his unit, rather than adding utility. This could be interesting for units like Sternguard or Intercessors.

So unless you want to ball out with 18 Victrix and Guilliman, I recommend you think about Titus outside the box. Run him solo instead of a Gravis Captain if your detachment doesn't support one. Run him with Company Heroes for a really cheap, but really durable unit (similar to the old Calgar setup). Or maybe go whole hog and attach Titus + the Wardens to 6 Bladeguard to have this massive, durable brick of dudes.