It's not that OP. I'm going to get this out of the way and say that I have not played as Stormcaller yet, although it seems like fun. My maxed out Titan subclasses are balanced. Ward of Dawn is fairly easy to shut down, Fist of Panic is predictable (he's running at you SHOOT HIM) but hits hard and Hammer of Sol is based almost 100% around the super, no grenade perks and sub-par melee perks.
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The thermite grenade is one of the more tactical grenades in the game(and is -blam!-ing awesome in pve) and the sunstrike is extremely useful as it burns your enemies health or when paired with cauterize you regen your health on a kill. Not to mention this is obviously handy in cqc in pve but also has proven to be quite handy in pvp for me thus far.
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It is fun just to clear a hallway in PvP or a line of Thrall in PvE with one thermite grenade. If only the Armamentarium were a year two exotic