I can see both sides of this. I would agree that overall, Stihl saws are probably the most reliable. And if I could only own one saw it would be a Stihl.
But I own several saws, use them fairly regularly and owning an heirloom chainsaw in not that high on my list. As Ben said getting a year out of a saw that you use every day is all you can expect (even if it is a Stihl)
Actually you have to use hours to talk about a saws life.
For myself, I look at performance, vibration,and just whether or not I like the saw before I worry about reliability. But I wont like it if it not reliable.
If you are talking about hard daily use it is a spare after a year or so. Even if it is rebuilt after awhile it makes a lot more sence to buy a new one.
I also agree with Ben that the average chainsaw user has no idea. (Us ASers are not average)