Fist of Havoc can shut it down, but the chance of doing so isn't great. The super is poor. You need to be right next to him to do it. He can throw a hammer at you from 50 yards away and get a kill. Nova is a better counter. As you say, Golden Gun won't kill if he has max armour. There is no real reason not to use a full armour build as a Sunbreaker.

With Death from Above you can close that gap pretty quickly and Unstoppable means you can tank a hammer while you're at it. Now that the Helm of Inmost Light can be acquired with useful stat rolls, this is more of an option than ever for Striker Titans.

All fair points. My question to you would be, why would any Titan choose to use Striker over a Sunbreaker for PvP? The super has nowhere near the killing potential. The only good thing Striker has over it are Lightning Grenades. I expect the vast majority of Titan's to use Sunbreaker. At least Hammer of Sol counters itself quite well!

In 6v6 or Rumble I would rather use Hammer of Sol but in Trials or Elimination, I still think Fist of Havoc is more useful, here's why... 1. With Unstoppable, Fist of Havoc can tank insane amounts of damage and still shut down opponent's supers. Nova Bomb is the only super in the game that is capable of one hitting this setup. 2. The fear factor. If the other team knows you have a Titan smash, they tend to be more reluctant to use their own supers. 3. Minimal risk/maximum reward when dealing with Defender Titans. Nothing shuts down the infinite super shenanigans faster than a well placed Fist of Havoc. Granted it doesn't happen often but I have seen people try it.