WD Blues are not all that reliable in my experience, but that's hardly a valid statistical sampling.
BackBlaze's reliability report for 2015 is not complimentary for WD 3TB drives. Personally, I'd get a generic enclosure or inexpensive NAS/RAID enclosure and install Toshiba drives. They are more reliable than WDs, for the models tested by BackBlaze. Excessive handling with a dock can risk physical head damage if you drop/bump the drive.