Big John was an LAPD cop in the late 80's and in the 90's and was training BJJ before anyone knew what it was. He has seen some serious shit and is a legit tough dude. He is a good ref because he's not intimidated or starstruck by any fighters.
Big John has a big ego and it appears he thinks the fight is about him at times ....
Big John has made plenty of mistakes including the biggest against Sakuraba @ UFC Japan in the late 90's.
It's strange because John started out pretty shitty IMO ....then around 2005-2008 he was really good and was looking at things clearly, I believe this is also around the time he was having some disputes with the UFC.
John was blackballed by the UFC for a few years 2008-2013? During this time he was still reffing in Affliction, Strikeforce, EliteXC ect and was doing a great job.
But it wasn't till he made to his return to the UFC that his personality changed and he started like he had some serious power he needed to enforce ...
He's been there since the early days but that doesn't make him a great referee.....he's good ...not the best IMO.
I'd give that title to the likes of Marc Goddard - Josh Rothenthall? ....and a few others.
Yamasucki needs to be fired, Herb Dean needs to be investigated, Mirgliotti is a big ol meat head but I feel he's trying his best so I give him a pass.