I'm still pushing my team forward on using jQuery Mobile. I was hoping, praying, that the biggest UX issues would be solved by the time we were ready to launch our app. Unfortunately, it doesn't look like that will be the case.
My biggest issue is one that seems minor on paper, but is infuriating as a user. I'm talking about the 200ms tap delay that is prevalent inside any Mobile Safari instance. I've seen dozens of "fixes" for this issue published in jQuery Mobile builds, but here we are, at March of 2012, and apps still feel incredibly sluggish due to this tap delay.
I'm going to have my devs take a hard look at the behavior to see if they can code up a bespoke solution, but golly, I was really hoping we wouldn't need to waste our time.