Nice to see another MUGEN player. Even though the game can be quite "buggy", once you get some of those characters out of your game, it can run pretty well, almost "official." Its also a great game for learning some real basic coding type ideas, I know that's where I learned what I know about coding. My game isn't perfect, no. Honestly I ALWAYS keep the timer on during matches, in case something glitches, the timer will catch it. It's better than having to reset the game, imo.
As I said before, it's honestly the MOST popular game on my machine with my kids. My 13 year old daughter has no interest in Street fighter, Mortal Kombat, etc. But she loves MUGEN, lol. I also have a 3 year old son, he's too young for aes yet, and when he gets older I'm gonna start him on Ninja Turtles and other beat em' ups. But I wouldn't be shocked if MUGEN becomes his favorite game on the system as well.