You need to understand a couple of things about all of those articles. The articles are not talking about your home or small business NAS with four or five drives to start with. The ZDNET author has a history of writing articles and article titles to bring people in. Many disagree with Robin's findings. I wouldn't say that is the case with the only article that relates to this review though, Why RAID 5 Stops Working in 2009. In that article he references a 7-drive RAID 5 array. With 6 or more drives we use RAID 6 (RAID 10 in some cases) for the very reason he cites. With five drives and in a home or small business environment RAID 5 is sufficient as long as you are proactive. Keep the system on a battery backup, keep air vents fee of dust and if a drive fails replace it right away.
Some users may want to take redundancy to the next level and run RAID 6 on a 5 drive array. That is fine and I know people that do. I don't recommend it on a sub-1000 Dollar system that already has performance issues with RAID 5 though.