Commentating anything is a hard job. On one hand, you got to speak to the players that know the game well, but also got to explain to the less educated what they are seeing. Football guys need to point out the linebacker that stuffed the whole the RB was trying to get through. Baseball guys need to point out how that breaking ball threw of the timing of the batter... otherwise people don't know what they are seeing. All the while, they need to make it entertaining when it isn't at it's most exciting points.
I remember watching the Olympics a few years back.... Judo came on. (Not a great spectator sport.. though probably fun to those who love to train it.) One commentator seemed to be a commentator. The other was a Judo practitioner himself. The 1st guy asked "Tell us the differences between Judo and Karate." The practitioner answered... but I could hear annoyance in his voice... he wanted to call the match not answer the most basic of questions... but most of the audience probably wouldn't know the difference until it was explained. How could they have worked together to speak to both the die hard practitioners who look forward to this rare time their sport has the spot light... and spoken to the people who only care about it because it is the Olympics and a representative of their country is competing?
I also remember watching Winter X Games once... I really liked the slope style commentators. They threw out there lingo, while also finding time to explain to me what was going on in a language I could understand.
Switching to street... commentators were firing off there lingo but I needed to be told what I was watching and wasn't. I was confused... and bored... and changed channels.
MMA... my 2nd favorite sport to watch. Amazes me how guys like the UFC's Joe Rogan can explain the ground game so quickly and efficiently... he knows anyone can appreciate when the match looks like a rockem sockem robots match, but gives us appreciation for grappling... something people aren't likely to understand without help.
Other commentators... Mauro Ranallo (Former Pride, Elite XC, and Strikeforce)... the guy annoyed me. Tried to add a lot of emotion in but not enough substance. Good voice for the job, good speaker in general... but didn't translate to a Joe Rogan level performance.
Tieing it into smash... it is tough. They have the advantage that most people have probably played the game before. What people may not know is the players... If you just decided to study smash and you heard all this stuff about ZeRo... doesn't mean much until somebody points out how freaking good he is.
They need to speak to both the local champions who understand the game but are studying to see the next level of play... and those who are just starting to learn the game. Can't get to basic to bore the former group... but if they overwhelm the latter group with new lingo they haven't heard before... it will not be fun for that group.
Then the key word fun... many can pick up a mic and tell what is happening if the understand it themselves... being both an educator, and an entertainer that adds to the experience of the viewer is a rare gift. Because it isn't a job that pays (is it?) I doubt there will be to many people who could be great at it putting in the time to become great at it.