I'm fairly sure the "Kombat Pass" is a redeem code you use in the PS store to unlock multiplayer capability for your PSN account. The story mode is easily the best I've seen in a fighting game, though it does kind of fall apart in the end. I thought Shao Kahn isn't as cheap as he appears, at least on normal. While frontal attacks wont always interrupt his moves, and the hammer throw cant be blocked, there is a fairly simple way to beat him (on normal at least)
The trick is to get behind him when he's pulling a move. Raidens teleport makes it incredibly easy, especially when Kahn goes for his hammer throw because its very slow. All that's left is to spank him with a combo, repeat a few times and its over.I'm looking forward to trying out multiplayer if PSN ever comes back online.