I've had a few HDDs go bad, but I've never had a sudden failure that I couldn't attribute to abuse or misuse.
Two 80gb Seagates about 10 years ago died slowly on me, over the course of about a week and I was able to salvage all the data on them.
I had sudden drive death on two WD 250gb Caviar drives a couple of years ago and it was my fault. I was repeatedly moving them in and out of external enclosures, while sitting on carpeted floors. Guess where I would lay them down, circuit board down of course..... yep, right on the static filled carpet. They both put up with it for awhile, but in the end, stupid practice will get you bad results.
I've had, probably 30 HDDs in the last 10 years and those are the four that failed, ~13% failure rate. Take away my stupidity and it's a ~6% failure rate and all data was salvageable before total drive death. All the rest (Maxtor, Seagate, IBM (even the Deathstars), Western Digital, Fujitsu, etc.) all lived out their useable life cycle until they got put on a shelf and then sold on eBay or something.
HDD tech is frickin' amazing if you ask me. They are doing for storage what single core CPU speeds were doing 6-7 years ago. At some point you've just gotta wonder where the ceiling is.
I'm looking forward to my first 6tb HDD. It'll probably cost $90, get wrapped by NewEgg in bubble wrap and show up on my door in a box full of green styrofoam peanuts that is 10x too big. I'll stick it in my tower and it'll run for 3 years without a hitch.
I don't get why people complain about this stuff. If it's that big a deal, spend $70 and get a 2nd one. Run RAID 1 from ANY modern motherboard and if it dies, replace it under warranty, slap it back in the system and keep on plugging away.