First off, thanks! I'm not too proud to liberally borrow ideas from everyone hear. Without Riptide, I would likely still just have a generic goodstuff peasant cube, which is obviously still fine, but not as exciting as what I've got cooking.
As for my analogy, let me elaborate. Madness tends to require more direct synergy than flashback (i.e. it's inherently a more A+B mechanic) so that's why I think it's more of a combo mechanic than a midrange one. It also tends to have you commit to immediate explosive value over carefully planned long-term value, which is why I call it more of an aggro mechanic than a control one. As with most theater of play discussions, these are obviously just generalizations and have lots of exceptions and corner cases.
I'm not surprised that madness-oriented aggro has picked up so much traction here since it seems to come from a direct line of thought from Grillo's thread a while back about aggro decks in pauper, which tend to favor bursts of value over curving out dumb beaters.