Guys jinx is still good right ?

is trash and an auto-loss still.

48% win rate: http://na.op.gg/champion/jinx/statistics/adc

It depends largely on matchup. For example she outscales Caitlyn in terms of sustained damage, and outranges hard-engage ADCS like Lucian and Kai'Sa.

At the end of the game, if she's full build, she's stupid strong.

If she can make it to late game, sure. She's good.

But before late game, no, she's garbage.