I liked his character in The Leading Man, but the film itself wasn't very good in my opinion.
As an action film I thought U-571 was pretty good, but his role could have been played by just about anyone, which is why maybe he got that part in the first place.
The other films I've seen of him aren't that good, in fact most of them are like you would say crap.
But I think if he didn't have a music carrer, he would have made it already.
I doubt that any actor could make it by doing 2 films every 3 or 4 years no matter how good they are.And Jon isn't the best actor around.
So I would say yes, as of now he has failed but there's still hope for him, hes not aan excelent actor but he is consistently better than some A listers out there.