#4 Scott Steiner
Although he does go somewhat under the radar, Scott Steiner has had a very successful professional wrestling career. He was associated with WWE way back in 1992 as one half of the successful tag team unit The Steiner Brothers, before finding greener pastures with World Championship Wrestling.
He quickly established himself as a force to be reckoned with as a singles competitor and was arguably the biggest WCW superstar at the time of their unfortunate collapse in 2001 and had plenty of offers on the table.
He joined the WWE once again in 2002 amidst much fanfare with the 'Big Poppa Pump' gimmick, but just didn’t live up to his big expectations in the ring. This was primarily due to injuries, although his unsuccessful feud with Triple H didn’t help matters either.
Steiner barely lasted two years with the WWE and was unceremoniously booted in 2004 after the Royal Rumble pay-per-view. Instead of taking it on the chin, he came out and personally attacked Vince’s daughter in the press and also criticized WWE's locker room politics.
Given the type of guy Steiner is, I know that it must have infuriated Vince McMahon. Although he has no chance of returning to pro wrestling, McMahon is almost certain never to forgive him for those words.