For their points I don't see much use for the Triarch Stalkers either. You could just take an HQ if you wanted to buff a units shooting attack. I don't find their weaponry much to write home about.
Praetorians, one of my favorite units, are in a similar boat. They're good, and are less points now, but lacking the dynasty keyword they can't even benefit from a Cryptek, Lord, or Overlord.
Deathmarks are the stand out unit for me. Take them in a Mephrit list and they can do some real damage. A friend proxied a mass Deathmark list and it put out a stupid amount of damage to anything it wanted to shoot at.