Monster Brawl is something of an exercise of thinking outside the box. Here are film makers who had no real scriptwriting ability, and nothing but some fairly conventional make up designs. They could have made something unworthy enough to be on Syfy on a Saturday night. Instead they said, "Hey we are cheesy fakes let's go with that." What else is a cheesy fake? Why professional wrestling. Hey, let's have a monster wrestling movie.
And so Monster Brawl was born.
It's nearly critic proof because it's intention is to be cheesy. The monsters, the back story, the actual fights. Cheese, cheese, and more cheese. It's helped along by Dave Foley with his "I don't believe I'm here and presently mostly sober" act and Lance Heniksen adding "Mortal Combat" style commentary like "Awesome" or "Death by head butt."
All in all I liked it....