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:

-- "The Marine 3: Homefront"

-- "The Marine 4: Moving Target"

... and he played himself in "Scooby-Doo! WrestleMania Mystery"

The Rock's biggest credits:

-- "Fast Five"

-- "Fast & Furious 6"

-- "G.I. Joe: Retaliation"

-- "The Scorpion King"

-- "Walking Tall"

... and he's considered one of the biggest action stars in Hollywood.