Quinn is easily one of my favorite champions specifically because of her flexibility. Her kit does allow her to survive in the jungle, though sustain is definitely an issue early on. After she gets her ultimate she can turn into an excellent roaming assassin, and her dueling abilities allow her to counter jungle relatively well. I prefer to take Quinn top lane, since she counters most top laners stupidly well, but her jungling is definitely something most people won't have a clue how to react to. One of Quinn's biggest issues is that she -has- to make a big impact early game, or she never really manages to do much of anything, and without the right team comp to back her up it's incredibly difficult to get the snowball rolling.
This is one reason that her re-work concerns me, because I'm worried that Riot with simply try to force her back into the ADC role and kill her top/jungle ability. I absolutely love Quinn the way she is right now, and I'd hate to see her current playstyle wind up getting gutted.