The point here is, Drobo/RAID/NAS are disk redundancy solutions - they cater for the fallibility of spinning magnetic platters, and never promise 100% reliability. Just like any solution, if you want to avoid data loss, you need to have an orthogonal backup system for when the other fails at a system level.
It sucks that he's had such problems with his Drobos, and it looks like the support he's got is subpar. This is not, however, the universal experience. Based on my experience, I'd be happy to recommend the Drobo to most people I know who want a simple and easy to setup solution for hard drive failures, with the big caveat that they still need at least one other backup solution.