Self-explanatory title. Only those for playable characters, so the Sindel Massacre shouldn't be mentioned as I'm sure it's the first bad victory that will come to most people's minds.

Kitana beating Smoke and Johnny simultaneously would probably be the second thing that comes to mind for most people as far as non-sensical victories go, so if possible, could you state other examples?

Anyway, as for victories that made sense, Sonya vs Bi-Han, Stryker vs Kintaro and Ermac, and Kabal vs Noob/Mileena and CSZ, just to name a few. It's good that the secondary heroes were allowed worthwhile wins, to show that they were chosen for a reason, and that the Shaolin Monks aren't the only good fighters. While I'm not sure Mileena needed to be teamed up with Noob for any reasons other than gameplay ones, Kabal beating Noob and CSZ was okay with me.

A victory I didn't like was Scorpion's against Sektor and Cyrax. Obviously didn't do much good for Sektor's character, but what it did to Cyrax's wasn't much better, as he was one of the playable characters thus one of the heroes even if brief, yet couldn't beat Scorpion even with someone else's help. Easily made him look like the weakest of the playable characters.