Maybe I'm just not keeping up, but Western Digital seems to have been on a downward path for quite a long time....I'm not sure why they are still in business.
Back in the early 90's, WD drives were OK, but seagate had a better reputation for anything important. Since then, they seem to have just languished - acquiring other companies products. Their enterprise/datacenter drives aren't that bad, but seagate still seems to rule the roost. On the consumer end, quality control has been quite hit or miss and despite their making ever larger drives at cheaper prices, I would never trust their drives with anything important.
As for SSD's, their competition has really been for the last several years between intel vs samsung versus 3rd parties (kingston/seagate/etc). Does WD sell a lot of SSD's comparatively?