Gamma mostly affects shadow detail (higher gamma means less shadow detail is visible, lower gamma means more shadow detail will be visible), but MLL or ANSI black, for example, aren't really affected by gamma.
A lower gamma will make the overall image look washed out. But again, it may look more washed out by comparison, but seeing as how you haven't seen a calibrated ST50 in Cinema, how can you claim that it looks washed out?
I will admit that the GT50 gives you better options for day/night (probably why Chad B went with the GT50 over the ST50), hence why I said it's worth mentioning. I just thought that it was a little misleading to say that the ST50 only has one good mode to calibrate... no need to take it so personally. If you don't think that's misleading in anyway, then agree to disagree.