Who’s to Blame for What we saw today

I've watched Saints games since the early 80s so I wasn't around to see the garbage lines in the 70s. This is the WORST offensive line I have ever seen the Saints have. They can't run block. They can't pass block. They hold, They have pre snap penalties. They are just bad. What has happened? This is basically the same line as last year. What is Doug Marrone doing??? It doesn't matter who is playing quarterback. You could have the lovechild of Brees, Montana, Brady, Marino, Elway, Peyton, Fouts, and Mahomes playing quarterback. That offensive line would get them killed.