I'm always in the favored side, since my favorite character is one of the "must" and the others are among them. So I don't know if I'll ever have another chance like MK3 to say "my favorite character wasn't there". Still, MK3 I played with Kung Lao, Liu Kang and sometimes I used to try Shang Tsung. That's why I'm usually wanting those that get not much love. These people are cancer for the gaming industry tho*.
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In other news, I've been thinking how the early games abilities were focused on the boss. You see, MK1 had specials that were used to reduce range, because Shang Tsung had no fighting moves in his original form, so he was always dashing away. It's annoying when you fly kick and he dashes, so you lose the distance. But if you notice, all moves - freeze, spear, flying kick and thunder god, kanoball, shadow kick - are basically useful to a dashing boss.
When it went to MKII/UMK3, while some moves were repated, they improved, since Shao Kahn could be vulnerable on his feet specially - ground pound, low fireball, roll - and some from the air too. Also, his taunt opened a window to punishment.
In other words, the abilities of the common players are also made to shape the boss. Now, I am thinking: what should we expect from an unplayable boss in a game where meter bars are infinite, refilling, you have no breaker, you can mount a ridiculous amount of versions and she's called BOSS OF BOSSES?
I'm totally getting a SNK boss syndrome feeling.