There were a ton of 4GB, but I'll grant you that was a while
back. More recently I had a WD 120GB and 80GB fail, which
weren't abused and were kept quite cool compared to the
average drive (were in a full tower server with 3 x 92mm
front fans). I have a shedload of drives though, it wasn't
unusual but nevertheless, they failed just as others do from
time to time.
There's an article here whose writer doesn't think a lot of
them either,
http://www.pcbuyersguide.com/hardware/storage/hd_reliability_report.html
Not that they're trash though, not at all but taking a look
at larger samples such as the database at Storagereview.com,
they're all over the chart, some down around 15%, 40%, etc,
which has to be seen in context but even so, it paints a
similar picture as several other manufacturer's models which
it wouldn't seem to if they did actually have a
significantly better reliability.