Never had a single issue with my '08 with 53k miles.
Unless you want to count a blown light bulb.
Back to the concern with the 2nd shift.
Let's just put it this way, training lasted for *weeks*.
I think everything, in regards to quality will be OK.
They are NOT playing around anymore. Don't like it? There's the door. And if they don't like you, then you won't be coming back the next day.
Personally, I'd rather have a 2nd shift 2011 WK than a 1st shift WK.
BTW: The manufacturing facility is NOT all new. It's the same dang factory that all Grand Cherokees have come out of since 1992.