Well I apologise for my response too, I thought you were being a smarty-pants. Lol.
I mean it is very difficult for non network peeps to choose routers. I think many of the reviews you find online are buyers who have no idea what their issues are ( more likely to be their ISP than their router or inherant weaknesses in wifi ) and companies who are just placing false reviews online to send prospective buyers to Amazon.
I mean the XR500 has amazing hype surrounding it, and it really is an amazingly nice interface, but it has some really fundamental issues in the very things its supposed to be good at!
So reluctantly I am forced to agree with you. The simple fact is that the XR500 is pretty rubbish really becuase it just doesn't do what it supposed to do. I have been pushed in to understanding QOS and now am in the market for something different.
Amazing thing is that I have re-organised my network and with the addition of a switch and I don't really need smart or adaptive QOS any more. What I really need is device prioritisation. Looking at interfaces in fact the D-LINK 885L is a better buy for me than the Asus RT-AC88U. With the new switch on my network I have bypassed the router and protected it from much of the local traffic and it also means I dont need loads of ports on the router. I don't use the USB on the router so the D-LINK wins out there too. The latest D-LINK Firmware has a re-vamped QOS with traditional application based QOS and device prioritisation. the latter being what I need. Apart from the the two devices are the same hardware and any additional features the Asus has, I don't need. The D-LINK has the advantage that it's significcanlty cheaper than the Asus. Typical Asus. So right now I am looking at the D-LINK. But I have no idea about reliability. What really killed it with the XR500 is the way it would lockup. I don't mind a lockup once ever six months but I do mind once a week!