The MM can work if running on 4s with a less current-demanding motor but by the time you get the UBEC and a MM, you are about the same price point as a MMM, which is better suited for larger vehicles. People were using the MM on larger vehicles simply because it was the cheapest decent solution for an ESC.
You'll NEED a fan and BEC to run the MM with 4s on the revo. I used one most of last season in mine. Without the fan, I would thermal a lot. I use the medusa 60 with mine.