WD is not a bastion of reliability either.
I don't think your sample size of 6 drives is big enough.IDK man, they have done pretty well in the non-enterprise markets, I have 1/2 dozen WD drives that have seen 40k hours of 24/7 access on some drives, that have zero realloc sectors across all of those drives.
And a pair of WD 1tb blacks that were in my lan machine going everywhere with me instead of sitting on a shelf, zero realloc sectors in 70k hours one of them, the other has a few dozen but no other errors and no other slowdowns.
I have inherited a par of WD drives that were overheated and killed (wrong drive for the type of nas and they got to 60+C and eventually died), they were technically out of warranty (no Proof of purchase, and the MFG expiration date had passed a month or two prior to my warranty claim) but they still replaced them free of charge.
I have gone through a few dozen seagates over the years from the FW based fails on the 7200.10 and 7200.11 series to just plain insane realloc sector counts on DM001 series AF drives in workstations.
No drive is perfect and some drives even recover from some issues. I have a pair of HGST HDS series 7200 3TB's that both have realloc, one has in the 2k range, but it still works, sometimes reads slow, they are both getting replaced soon (un-important data storage like downloads and tv shows that I have original discs or that are recorded/time shifted by my plex server via OTA HDHomeRun tuners).
WD has had a few hiccups that they were quick to fix from my understanding.
All of this is from a (pro)consumer/SMB product standpoint, not enterprise.
The current report is interesting tho. looks like seagate has made some serious improvements.