Why don't you play OH and try to do panthers and win. I guarantee you it is not as easy as you say. You will learn a lot of things about your own game mistakes.
I agree with OP, if somebody throws a molotov at you, you don't jump into it and stay there...you run the hell out of it. I issue 10 clicks to move out of the molotov and they don't even move. For an RTS game this is pretty stupid. It's supposed to be real-time.
To answer your question:
i had 2 games in which I encountered TigerAce, lost both even if got all map and army...
Usually the guys save the infantry in the base and wait for TigerAce so after you ram it you still have hard time killing it...but ramming is the best counter.
I suggest when you see tiger ace, retreat all units and reorganize, ram it and kill it