Apocalypse is hilarious-- everything is supposed to die! Ka-BOOM!--- 106,000 points were in the last game I played--- 28 players!
As for Thunderhammers-- Dreadnoughts lose their ability to shoot if they are hit by thunderhammers-- that's essentially what happens to Titans if you get enough hits off.
Remember, most guns have 'primary weapon'--- giving them a 4+ save.
The Tau Titan I fought had a 4+ Invulnerable, +4 Primary Weapons and 2 Other Weapons Weapon. With the thunder hammers, to just shut that bird down, I needed 22 Thunder Hammer hits to statistically shut the titan down.
A dreadnought doesn't survive that, normally...
But a Titan can. I had engaged the Titan in Combat twice--- it charged me and Titan Stomped, and I lost a bunch (because not everyone had thunder hammers). I shut it down because I only did 1 Structure point to it, and LOTS of Shakens. I charged it the second time, and because I had the Sanguinary Priest-- tore the thing apart and it went Fa-Boom!