I would like to throw my 2 cents in:
Being a Pro mechanic I think I am entitled? maybe not lol but still I have an opinion on the Failures I seen on the internet. The design itself of the Valve train geometry is Poor! The Lifters are riding at an extreme flat angle and the lifters dont have a Large enough Oil grove in the Lifter to coat the entire bore in there full travel action.
This lifters I removed from 194K mile 5.7 show light scoring on the upper and mid sides from the lifter bore due to a Lack of oil film from being pushed into the sidewall of the lifter bore by the action of the cam.
The Roller Tip damage and Lobe damage I have seen on the internet I believe is caused by the Lack of splash oiling in the engine itself, The 6.1 uses Oil injectors to help cool the pistons this doesn't help the Lifters roller BUT it does Point to the inherant problem that the engine design does suffer from a Lack of splash oiling.
Generally splash oil is relied on in the industry for cam lobe oiling and Piston cooling and lubrication.
I am going to look into the possibility of adding the Spray tubes to the bottom of my piston bores like the 6.1 has, I am also planning on using Crower lifters that have a Larger oil grove for the lifter bore and have also been EDM drilled to oil the Roller tip.
High Performance Hydraulic Roller Lifters Mopar Hemi 5.7L & 6.1L with Edm - Lifters
Another thought was to eliminate the the Oil pan seal Windage tray that acts like a Pan cover to try to allow more oil to splash into the Crank shaft to try to throw more oil around, one more idea that I plan to do is add a Higher pressure and higher volume oil pump to try to increase oil flow pushed out of bearing surfaces.
Generally increasing splash oil is a Bad thing in most any engine let alone a Hi performance engine but in my case I am building a Low RPM engine that will see more low rpm off road miles than Hiway miles increasing splash oiling would be a Good thing Let the Oil control rings do there job.
As far as a Class action lawsuit goes good luck! I remember many of us who Bought a 2006 VW TDI diesels tried and lost, The BRM 1.9 has Bad cam design flaw with extreme cam lobe angles which cause it to eat Cam and liters every 100K miles, Its just a fact of life VW TDI owners live with and just plan to replace the Cam every 100K miles when its time for a Belt change any more.
I tried a expensive Hardened Chrome plated cam in the engine it still ate it!
I have 300K+ miles on it now and I am going on my third cam! The Head is off at machine shop being rebuilt now.
I get 41 mpg with it @ 80mph with the AC going up a 5500' 6% grade without slowing down so I am not complaining much, over all it is still a reliable 100K mile car.