Thats surprising to me. I never was a Callaway fan but I've never seen anyone have problems with them...
I will say, at the last club I worked at, we were a big Callaway account. We never had TONS of problems with Callaway stuff, but I will agree, they did have the most problems.
Most of their metal-headed clubs were fine, aside from the occasional face cracking, which is SO common now a days with companies going to thinner and thinner faces. But starting with the C4 in 2002, basically every composite club they've sold has had some failure or another show up, and not in single occurrences. Faces caving in on C4s, the weight chips inside the Fusion coming loose, the entire back composite part of the head falling off. You name it, and it's probably happened.
Granted, the composite head thing is still kind of a "new" idea, sort of (Cobra Ultramid anyone?). So, its understandable that they would have some issues here and there. But, the frequency that we would see them was kind of shocking.
Everything else from Callaway, and pretty much all the big name manufacturers, was pretty good. We only sold Titleist/Cobra, Callaway, TaylorMade, Ping, Cleveland and Mizuno, and all had their small issues here and there (again, aside from composite Callaway stuff). Nothing crazy, just the usual stuff like loose heads, cracked faces, unintentionally broken shafts.
I will say in their defense, Callaway is, in my experiece, one of, if not the best company to deal with when it comes to repairs or problems. Very rarely did we ever get told something wouldn't be fixed for free, even if it wasn't entirely their fault. And when things did need to be sent in, they were back to us VERY quickly.
Personally though, I think a lot of the issues people have are self-inflicted. Maybe I'm just lucky, I don't know. But, what I do know is that I keep very good care of my clubs, and I can't even remember the last time that I had anything break (that I didn't do myself). Leaving your clubs in the trunk to roll around, not putting headcovers on, not making square contact with the face, and so on. If people in general would just take better care of their stuff, I think they would be pleasantly surprised at how much better it looks, and how long it lasts.