Because you had bad luck doesn't mean that they are bad drives... I've built dozens of computer with them, no issues so far, maybe one or two failures but that's not much for hard drive (they'll all die eventually). I know hundreds of people with them, they are VERY popular as storage.
You will always find people who have had problems with certain product. On the other hand, there are thousands, even millions of people with no issues. Your experience is just one among millions of others.
I agree that HDs can be too noisy, thus I'd get 5400rpm drives for HT setup because speed doesn't matter. 32GB SSD as boot drive if you want more silentness.
With respect, the two drives that have died have been less than a year old - and one of the slowly failing drives began to fail after only two weeks.
WD said that they'd RMA them when the broke down, but that I had to make do with them until they failed completely. So, essentially, I have to entrust these drives, that are clearly dying, to store backup data that's extremely precious to me. You can imagine how happy I feel about that.
And I'm not alone. I have a couple of friends on another forum who've had the exact same problem with the WD15EADS. These drives are crap, and it's a personal crusade of mine to trash their reputation - we clearly don't agree, so I suggest that we agree to differ and discuss something else.