Actually, superior armor is not useless.
It forces the enemy to fire on a single unit with many of his own units. I can’t tell you how many times my opponent would have damaged one of my tanks with one throw of the dice (which would bring it one hit away death during that phase) had it not been for superior armor.
So, as a result, my vehicle received only a face-down disruption marker, instead of disruption and damage. That forced my opponent to use another heavy tank (if he even had one in his 100 point army) on my vehicle, needing another good role of the dice add on another hit, and a very good role of the dice to score two hits.
Of course, had he scored two hits with his first attack, he would only need one more hit to send my tank to heaven, with the other tanks that had only normal armor. SUperior armor has saved me many many times.