Its hard to consider it good in specific situations, when everyone refuses to use it and is basing its performance exclusively off of a singular, downhill tournament game..
Try it on maps that do not involve massive open spaces for TDs to plink at it freely and you'll see its much more useful.
My POV is based on 3vs3/4vs4, and there, if you consider that Ally TD have roughly have 100% chance of pen (worst scenario possible), it is better to "tank" with a lot of Health Point rather than counting on RNG-Armor, therefore it is better to swarm your opponent with many tanks (Panther in most cases) rather than a Big boy KT because is it more reliable/has more survivability and 2 "medium" guns do more damages than a "big" one.
Such strange logic can be illustated with Churchill. On the first glance, it doesn't have that much armor (a Panther does pen it reliably) but with it's enormous HP pool (1280 like the KT if i am correct) it is a good "swarming" tank.
So IMO, the Heavy/Super Heavy tank role isn't properly define because the Ratio Cost/Performance isn't good/ linear with medium/premium medium tank. (in a more idiotic way, if it is slow and cost 2 P4, it should at least do as much damage and have the same HP pool as 2 P4)