If you seriously think a 160 penetration (same as faust) engine damage crit is useful for 310mp/100fuel, I have no words. The chance of a weapon crit AFTER PASSING THE PENETRATION CHECK is 5%.
its meant to be used with a t34 thats about to die. considering a t34 is significantly faster than infantry, it means you can hit vehicles that would otherwise kite your squads.
ram is still useful. it might not be able to take a heavy tank out of a game on its own anymore, but i think we can all agree that was ridiculous, especially with industry. relic wanted it to be used as a last resort and thats what it is now.
keep in mind, the t34 is also significantly better than the days when it was only useful for ram