The only gripe out of owners of torsion suspensions is when they go to lift it. The other suspension components are, if anything, better. The upper control arm might be viewed as weaker but I don't know of any manufacturer that has had a problem with upper control arm failures. The lower control arm is beefier than normal due to it being the component that supports all of the spring mechanism.
Tie rods, ball joints and the like can and would most likely be of all the same quality. They are not directly related to the torsion bar vs. coilover debate. I believe I answered the question for you from a manufacturer's standpoint. Torsion bar systems are cheaper, lower unsprung weight, more durable, less prone to need adjustments, etc.
About the biggest negative to them is the inability to create progressive rate springing, unless you want to lift the vehicle and don't have an aftermarket company that's spent the R&D dollars to come up with a new design.
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