There has been discussion on a few pages I have visited with some of the types saying that the Tiger 1 & Tiger II were ineffective due to their low numbers V's engagements.
This chart I used the Pershing's turret as a target for the 88mm/L56 Tiger 1 main gun and the 88mm/L71 Tiger II main gun.
Even the Tiger I main gun can penetrate the Pershing's turret at considerable range mind you the Tiger would be in range of the Pershing's main gun as well.
Some ppl just cannot take the cold facts that on the Eastern front the kill ratio is some instances was 20/1 in favour of the Tiger (Think Wilbeck quotes this)
One person even said a single M4 75mm armed tank took on a Tiger I and won to which I quoted what Pat Dias said about facing a Tiger I in an M4 alone.
Pat came face to face with Wittmanns Tiger I at 100 yds Villiers Bocage engagement Pat's gunner fired twice both AP's bounced off the Tiger.
Wittmann's Tiger fired once the shot did not bounce off it killed 2 of Pats crew and blew him out of the commanders hatch!
Yes they were few in number but they could be very effective in the A/T role.