I have read the Cortex System,but not played it.
I have played Savaged Worlds System several times. The system is as advertised - Fast, Furious, Fun. If you throw average or better for the die type, your character will do rather well. If you throw a lot of 1s, your character will be out of the action/fight rather quickly.
The game I played in was a homebrew fantasy. I had a very good character, a dwarf fighter. I threw a lot of 1s, so he did poorly. I was somewhat disappointed. He was not much help to the party.
The game I ran was a One Sheet Sci-Fi in the Necropolis game setting. I threw a lot of Aces (max the die roll) for the bad guys and a tough adventure quickly became impossible.
I tried switching dice. It didn't help. As a player I roll poorly and as a GM I'm a killer. It was suggested by the other players that I buy an Electronic Dice Roller. Oddly enough this has not happened in other game systems.
In Savage Worlds most Main Characters have three wounds and Extras only one. If someone throws a string of either very bad dice or very good dice it is over rather quickly.
Savage Worlds is very playable. On the surface it is rather simple (not simplistic) to learn. As one plays more, one learns little tricks that make certain actions more effective (certain actions together are much more effective than the action alone). Savage Worlds really will run any genre.