I suppose complexity is completely relative, but I can say that what I'm designing doesn't have an elaborate set of linking and moving parts.

I'm currently working on multiple views of a couple of USB devices and a couple of handheld remote controls. Top view, sides, ends, bottom. While these are great for general layout of things like buttons and ports, it's very difficult to properly portray fillets and chamfered/radius edges. Shading helps, but without the object being 3D it's all really a matter of manual interpretation.

I'm mostly interested in modeling the exterior of these designs right now, not necessarily the individual molded components that make them up. Nor the requisite bosses and other supports that plastic parts need internally. That should be able to be handled later by a contract manufacturer experienced with their processes.