So the steam tank is possibly the most devastating weapon in the imperial arsenal. In fact, the stank may be the sole item in the empire book that makes it a competitive army.
Well I play empire, and I love empire, and I'm here to tell you that the steam tank is
Why? Because it does massive amounts of S6 impact hits? Nope. Because It's T6 10W with a 1+ armor? Nope. Because its unbreakable? Still nope. No, the Stank exemplifies terrible design because it breaks one of the fundamental rules of the game
THOU SHALT NOT CHARGE THAT WHICH IS NOT IN THINE FRONT ARC.
This rule is what makes this game fun. Unlike 40k, in which you just put as much firepower on the table as you can and then roll dice, Fantasy is a game of maneuver, because you have to position in order to be able to charge what you want to charge. This opens up opportunities for your opponent to chafe etc. In short, counter play. But the Stank makes maneuver useless. There is no outmaneuvering a tank, it can go wherever the hell it wants, when it wants, and deliver a bajillion S6 hits when it lands. When something like a chaos spawn breaks these rules, it is tolerable because the spawn is a limited threat- it can't kill much.
But the Stank can. Oh god can it kill.
In short, I would like to see the tank significantly reworked in the next empire army book. The destructive power is fine, but it's maneuverability is not, if anything it should be LESS maneuverable than a block of infantry, rather than more.