It suffers from too many "workbenches," some of which appear to be redundant or dated. You never know whether structures created by one are "compatible" with the M.O. of another (like "Part" vs. "Part Design").

And it presents nonsensical problems, like offering to create a sketch on the face of an object and then complaining that the sketch doesn't belong to any object. So you have to manually drag it under the object in the treeview. So gallingly DUMB.

Despite all that, I will wrestle with its ineptitude before giving Autodesk a penny. I get stuff done with it and respect those who give their time to develop it.