Like most things, the truth is in the middle with McD. He did some good things and some bad things, but I feel like, many of the bad things are rumored.
Anyone can feel free to add to these, but here are the things off the top of my head:
Good: televising home games again, bringing Foley back, bringing all the legends back, all the outdoor games, the 2017 NHL Draft in Chicago -- you really can't argue these aren't good things.
Bad: having a hand in ousting Tallon (supposedly)/Quenneville, treating his staff like garbage, trying to control player personnel and moves, encouraging big splash moves simply for marketing purposes (although one of those was supposedly Hossa).
In all honesty, I was pretty neutral of McDonough -- I didn't hate him, I didn't love him, and I really don't care that he's gone now -- but it's not like he didn't do some good things at least. He jumped on at the right time -- yes -- but you can say the same thing about Scotty, Stan and even Joel.