It's not you - the whole experience of spending $30-LARGE and getting SHIT in return has me pretty pissed off.
I have read post after post from professional technicians from all over the country fixing broken valve springs, pitted cams, prematurely worn out cam bearings, stuck closed AFM lifters, broken valves, and the list goes on. Guess you'll just have to take my word for it. When my engine finally grenades (which will be years down the road, since I drive my well-built '86 Grand Marquis and '93 Volvo 940 when I'm not hauling, and leave the junk in the garage) you can bet I'll have detailed pictures and possibly video of the whole process.
GM HAD a great motor, then decided to cheap out on it starting in 2007. You don't see ANY of these types of valve train failures on '06 and prior. They happen, but are extremely rare. '07 up, they are pretty much guaranteed for the most part at anywhere from 91k in my case, up to 160k in other cases. Majority of the ones I saw posted were 110k-130k. Not what I would consider "high mileage".
My Grand Marquis has 246, xxx miles - original engine, original tranny, original rear end, and original fuel pump. Those days are long gone unfortunately.