what's the worst thing mopar has done?

In no particular order:
Dropping plymouth
Dropping rear wheel drive
Dropping direct connection
Those stupid cross hair grilles on everything except the challenger
Merging, merging, merging!
The prowler, ugly and underpowered
Lean burn
Rubber floor mats (guaranteed to rust floors)
Vinyl roofs with bondo in the seams and no paint or anything on the roof to protect from rusting
Wiring power through the ammeter
small bolt pattern after '66 on a-bodies
There's many more i can't think of right now, but the worst thing hands down was.....

Destroying all of the tooling for the cars from the muscle car era including hemi stuff, and especially sheet metal tooling.
We're a lot better off these days thanks to AMD for the sheetmetal and the aftermarket for reproducing a lot of needed items for our restos, but in the '80's, we were really screwed.
I'll never forgive them for that.
Tom.