Percentage wise, the number of engines negativity effected by the "hemi tick" are low when you look at total production. I don't think I've personally known anyone who has to have their engine replaced, or had a cam live wiped from it, and I've been part of the Mopar community since before the modern Hemi was even in development.
Back 15 years ago, the biggest issue was the timing chain tensioners on the early 5.7s failing. I know a couple guys who had to get their timing chains replaced under warranty, and a few who pre-emptively replaced them to prevent issues.