How do you arrive at this conclusion, though? I mean the 1944 version of the IS-2 had 120mm, which was very tough for a tiger I to penetrate, even with the APCR round.
The IS-2 did have 2 models though, and the first one had a much weaker and inferior armor layout.
The Tiger had no problem penetrating any (land)vehicle the Soviets constructed during the war, and with APCR it could defeat the armour of several postwar tanks.
A rule of thumb for closing spent out balance threads on CoH2.org should be:
"A balance discussion degenerating into anecdotal performance of WW2 weaponry and panzerporn is a clear sign that nothing meaningful is to be added to the actual balance subject; as the fanboys resort to irrelevant trivia as a pathetic attempt lobby their agenda (Also proof they are clueless about actual game balance & design mechanics). Terminating with extreme prejudice is advised."
I'm fairly sure it's our good right to argue about history and WW2. It's an interesting subject, you know. There is nothing left about the Tiger ace to discuss. It's a failed idea, a thought experiment, a 'the Wave' of CoH2.