Some issues are critical, many are overstated or possibly can't be exploited (a bit clickbaity). However, update if you have one of the affected routers.
I agree. I had a look at those vulnerabilities and really they make good headlines in the tech press, and probably justify someone's budget, but there is little of a real zero day threat level in the wild.
The issue is for ISPs who have large router domains. Either they push updates through their CPE programme or, declare the threat as "not our problem". I had an ISP who sent out new routers because they could or would not do an OTA update. I received a shiny new box, so no wukkas.
OpenWRT is perfect for those who are both
tech and network savvy; it is
not a platform for network newbies, I will add controversially. OpenWRT is a good place to learn networking principles though. Plus, the distro adds back the functionality that manufacturers are so keen to rip from their products. btw I recommend users place their OpenWRT router
behind their ISP router though, maintaining their ISP's kit on the WAN side. Two firewall zones are better than (by wrong configuration) none.