I'm painting with a broad brush here
You're right.
This team just isn't as talented as past Bengals' teams. Losing Sanu and Jones, coupled with Eifert having yet to step on the field. Starting a rookie at RT who's struggled, having the worst Center in the NFL, and a 1st year OC who looks like a major step down from Hue are all factors. On the defensive side, whenever you can't generate a pass rush, you're going to have problems. Looks like injuries are catching up with Michael Johnson at this age, and not having hit on any of the young DEs like Clarke and Hunt is costing the team. Having stop gap guys at LB like a 36 year old Karlos Dansby, instead of young and cheap guys flying around hurts the team speed.
With all this said, I'd be shocked if Marvin isn't gone because this isn't a playoff squad. But all of that stuff that you typed before that was you painting with a broad brush, as you suggested. They "lost control" because the Pats are a much better team. They were 10 point underdogs for a reason. Better to carry on with the narrative, though.