[smaili]

As someone who's played for quite a while I can tell you SSBM is one of the most complex games I've ever come across.

[jensv]

Why do you think the game is complex? Fairly simple game with low barrier to entry which is great when you invite guests over for games. Super Simple Button Mash!

[chrisdbaldwin]

Likely due to the advanced, non-intuitive mechanics that have been discovered over the years. The entry barrier may be low, but the skill cap is high.