The worst track record long term in domestic U.S. built cars is General Motors. Surprisingly the best GM track record is the Chevrolet Corvette and the worst is the Cadillac with regards to reliability.
I would believe that since the 90s were disasterous for GM quality. Not sure what happened, but I think greed definitely took over.
Corvette the most reliable? I guess that could be, but don't tell that to a owner of a 90's ZR1. Back in the day, the fuel pump alone was over $1000. That quad cam monster was a gem in it's day that was a black eye when it came to be repaired.
Caddy went down with the Northstar ( AKA deathstar), and quality issues with many sensors etc.
The death of Pontiac in 2009 was a direct shout out that GM didn't care about their heritage anymore, just their profit and pocketbooks.
Same went with Oldsmobile. I dont know what the hell that Vibe was in 2010...sure looked like a Toyota to me...
Then to try and save face...they bring back the Camaro. Too little, too late. I think the devout GM performance fans long left nor will they return for that piece.
I'd prefer a 60's 70's and possibly an 80's GM though. Yea, their reliability wasn't all that great, but they can be improved with aftermarket parts.