After reading the reviews, and seeing that most of the reviews are generic, it seems to me that very few of the reviewers have actually used FreeCAD.
Here's something from two separate reviews:
It's path module is really great, because you can predict the mechanics of cars which is excellent for fixing possible problems beforehand.
Another one that doesn't make sense to me:Pros: The Path Module is awesome I can see how the mecanichals process of the cars and electricity circuits works and know how I need to add to modify some aspects make them to work betters,
Pros: The learning curve is much faster with the Polygonal system, since it is to draw in plane and to extrude. This is the main advantage of SketchUp. The use of the mouse to place and modify the polygons and to be able to give the exact measurements by means of a keyboard makes designing with this application incredibly intuitive.