Depends on the model, making a blanket statement like that is silly. Plenty of Stihl models, like the 362, had plenty of their own problems, it happens, how the manufacture deals with it is what matters. Husqvarna did not handle the 550 and 562 debacle well at all.
The 562 and 550 were total garbage early on and have gone through many improvements. The 550 has actually been totally redesigned. While many say the newest 562's are now reliable I have my doubts, it's just not that robust of a design, and it still has a hard time dealing with heat properly. Fact is the 550 and 562 were/are flawed designs IMHO. The new 572 is so far proving to be extremely reliable and durable.