I'm not a military expert on this, but I have read a couple of times (at least Piekalkiewicz I remember) that strategy wise the Tiger was counterproductive. Technicly brilliant in ever sense, but The Panther was much cheaper to produce. One Tiger costs about 2 and a half Panthers, and with the swarming of russian T-34s you would have needed to counter the masses with many Panthers. The Panther being a supreme tank too, since the shape and the anti-explosion layer was superior to even the Tiger.