Now at the risk of being controversial I actually liked the Mustang II and worked on them back in the day. I felt it was a bit of a return to the original concept of the uncomplicated parts bin type car from the 60’s. Now the fact that the clean air movement strangled the performance was a definite downside.
The article from Aaron Gold at Autotrader argues that the Mustangs problems were well before the arrival of the much maligned Mustang II.
Hagerty via Jim Koscs have an opinion on the Mustang II in the article, “No, the Ford Mustang II is not a re-skinned Pinto”