Well technically he turned a failing company into a failing company, then Forrest vs Bonnar turned it into a successful company with DW's assistance.
DW definitely comes off as a tool, but it's not his swearing that is the least professional of his attributes. It's how he has ZERO stock in his own word. Zero stock.
"Dan Henderson, I promise he signed with SF 1000%"
"Brock Lesnar may never fight again"
"Tito will never fight in the UFC again"
"Anyone involved with the EA game will never fight in the UFC"
AND MY FAVORITE:
"I have a huge announcement to make this weekend that will blow your mind/change the sport/etc." Then it ends up being that Coleman resigned or that they might have an event in China someday or something. Ugh.