Every time I look at Jinx' skill set she seems more and more like Tristana, tbh. If you max E on her, you will at lvl 6 be able to 70 - 0 most ADCs with your damage skills and ~3 auto attacks. Add the fact that her E is a root and suddenly she's very scary indeed.
Sure, she can max Q and be a harassing monster, but the AS on her minigun is useless until later, and the mana cost on her rocket launcher will dry her out fast at low level.
Essentially, I end up with this:
R > E > Q > W
The AD scalings on W and R means she's not completely useless during mid game, unlike an unfed Tristana. All in all, she looks like fun.
Also, I love her passive.