I’ve been making detailed models (including somewhat threaded holes and some threaded fasteners) in SketchUp for a few years, and I’ve been happy enough. As an example see the following post:
One thing that can make SketchUp’s renderings really “fuzzy” is when the current Style has endpoints enabled. This places a small black X or cross at each and every endpoint in the model. With a threaded hole that might have 2000 endpoints in a small volume, the visual result can be a black blob. I never have endpoints enabled in the styles I use.