Fighting words from The Miz ... this time, the WWE superstar tells TMZ Sports he honestly believes he's the Greatest actor in wrestling history -- and specifically calls out The Rock.  In Miz's defense, it sounds like he'd been drinking on his way out of Warwick in Hollywood Wednesday night -- but he couldn't be more clear, "There is no WWE superstar who's ever been a better actor than me." For the records, Miz's biggest credits: