My beef with the Windstar's axle was the dumb design in the first place which a simple FMECA would have told them to lead to problems. It was poor design and execution no matter how you look at it.
As for the repair, though, I wouldn't doubt its integrity. The axle is first inspected (including sandblasting) for corrosion and cracks. If it is found to be defective, then it is replaced. If it is found to be clear of cracks and corrosion, then (and only then - you have to have some faith in the dealer service dept to do the right thing) they epoxy reinforcement brackets onto the existing part and the unit resealed. So you aren't just gluing the thing back together and sending them on their way, as your post would seem to imply. And for attaching a reinforcement bracket, epoxy might just be a perfect solution. 2 part epoxies used to bond metals can easily show shear strength in excess of 2300 psi. You could do better with grade 8 bolts.... or welding. But you'll be using a much smaller surface area - welding you'd likely only hit the edges, and bolts, well, you'd have to use a fair number AND then you'd be putting more holes in the axle that could lead to more corrosion.
There's really no reason to fear epoxies... Heck, at 2300 psi, if the brackets were just a bit over 2"x4", a well-done epoxy job would be strong enough to hang FIVE Windstars from the epoxied bracket without it failing in shear.
That said, there are plenty of reasons to not want a Windstar.
disclaimer: I'm currently long on Ford stock and bonds