First of all, the drive was sold to you for use with Snow Leopard; Apple Store employees see a new product for the first time when it's released.
Second, unless Apple or one of the beta testers was testing with that particular drive (which they obviously weren't, or the bug would have been found and reported earlier), Apple would expect standards-compliant drives to work. Many millions of drives from other vendors still do work, so that tells you something as well.
Finally, you backed up your drive while running Snow Leopard, but Lion couldn't see it but Snow Leopard still can (and thus a restore from that drive would still work.) That's the OS the drive was sold for.
In short, you're blaming Apple for something that is absolutely 0% their fault; they did nothing wrong.
If you want to blame someone, why not blame the makers of your drive, who as developers had access to Lion seeds for at least the last six months, so must have known themselves that their products wouldn't work with it, and did absolutely nothing to address it.
It's amazing that after using Macs for 20 years, you don't get the difference between Apple's and third party products; to use your experience it's like when a new version of Mac OS would come out and somethng like Quark Xpress wouldn't work properly; people would know not to install say System 9 until a new Xpress update came out to make it compatible with the new OS.
Are those of you seeing this seeing it with WD drives that have no special drivers or software, like the Essentials series drives, or only those with "WD Smartware" software?