It is inevitably something of a sliding scale I think Rod. There are even twins using Rotax engines now (the Tecnam P2006T being the obvious one), a C150 or Piper Cub are in many ways very microlight-like in handling: although not really in cockpit or engine management. Similarly a CT is very light aeroplane-ish, except in engine handling which is still very microlight.
So yes, what I was saying is very general.
G