Robot boxing is awesome because it is robots.......boxing.  What more could you want??  Everything else that has combined robots and boxing has been awesome!  For instance:

How can you deny the total bliss of boxing against your siblings using robots in your basement?  Screw Hungry Hungry Hippos!!!  Rock Em' Sock Em Robots were legit!  Not convinced?  Fine how about this:

"Arena" was a movie from back in the day that had a human boxing robots and aliens for fun and profit.  Not one word in that sentence sucks.  Want a third example?  Sure.  Why not?

Robot Jocks was about GIANT robots fighting each other.  Many humans died.  It was glorious!  Those are pretty much the only times robots and boxing have been put together.  But they were all AWESOME!!  That's why I'm excited for "Reel Steel" to hit theatres.  Sure, everybody else on the planet thinks it's going to be stupid.  But what do they know?