Titans need to be buffed. They only have limited gimmicks within Arc to help them be competitive on their own and all of that comes at the cost of an unstable, P.V.E. focused Supers. A barrier of any type does not compare to the ability to cloak nor heal and yet it has nearly the same cool-down as a Rift. While it is indeed possible to catch a Titan on foot if you are set up right, you do not need to. Shoot them while they are gliding in their one set direction and you do not have to worry about chasing them. The fast ones tend to die rather quickly. Titans can get into position a little earlier but that is about the end of their ups. Base Titans have straight-line speed, not maneuverability. Anything can be made fast if you tweak it enough so I do not think that is a balance issue so much as a chance encounter of clashing play styles.