Been using D-Link for years. Been solid routers accept for maybe a couple. The DGL-5500 was a disappointment for sure.
Wasn't really D-Links fault, however it's there name.
The DGL-4500, 655 and 868L are rock solid routers and still are. The 655 has been the work horse for D-Link in many applications. I'm currently enjoying the 880L and 890L routers. I even went back recently to the DGL-4500 due to gaming capacities with more than one game console and what a breeze it is with the DGL-4500.
I do agree with some that the new UI is a bit less featured and not as granular as of UI past. Not sure why they went in that direction. I guess that maybe D-Link targeted the average home users rather then the more advanced users. The UI seems to be improving and they are adding items here and there. I presume that maybe D-Link is keeping things simplified for the average home user that this is why the UI has some features missing from UI past. After all, for the average home user, there are some features that are probably not used much. The average home user just wants to get it out of the box and connect it and have it work!
I do wish D-Link would have a advanced version of the UI for those power users. Seeing post here, I can empathize with you however for the most part, D-Link continues to make some good solid routers. Maybe not to the wishes of the more advanced users however, again, D-Link has been mainly in the home class router target so what they come up with is up to them. Why there are many different models and some support 3rd party FW like DD-WRT and OpenWRT. So there's always that consideration.
If some users are missing the granular UI of routers past which they may still be using, no reason why you still can't. Maybe the wifi isn't as good on the older router, however, users can disable the wifi radio on the older router and LAN cable connect up to a newer wifi AP while keeping the older router for it's UI and performance use. User don't have to always go out and buy a new router. I connected my AC class router in AP mode to my DGL-4500, BOOM, wireless upgrade for the 4500 while still maintaining the 4500's performance and UI operation.
I believe D-Link strives to make good routers and does actively fix security issues when notified. There seen here and there just like the other Mfrs. There not perfect nor is anyone else. They do what they can to keep things safe and secure. After all, security fluctuates everyday and new loopholes are found, even after release of a product. Hard to by psychic in this area.
For anyone looking at D-Link, give some credit and users looking for something new, do some due diligence first and go look and review what D-link has to offer. Look hard what what your realistic needs are. Ask questions with support and forum help. Do you really need a high end AC/AD class router, are you looking to really future proof or do you just need something to get you online, be safe and enjoy with out having to pay big bucks for a router with 8-16 antennae.
LoL. Some users shouldn't be so hard on D-Link. We all have complaints about one thing or another about each Mfr. After all we are there beta testers.
And over the years of experience, not all problems are due to FW or HW issues with any mfr router. There are many other factors to consider when trying to fix problems seen with routers and Wifi. I can only imaging how many routers went into the trash or given up due to false positives or mis-understanding of the root problem or not finding the true root problem of any router.
D-Links been doing this for a while now. a bit longer than some. I like there development and update cycle. They try to see things thru to the end even though I believe there is some improvement could be done in the development and testing department.
Of course this goes for all other Mfrs too. I won't name one particular Mfr which I will not be going back to and never recommend. Thank god for OpenWRT on that router!
I may seem like a fan boy however just a long time experienced D-Link user and enjoy them for what they are and what they have for me and others. Ya I have a couple of other fancy non-D-Link routers and looking forward to testing one of them new fangled AD class router soon.
Even though I don't have anything to support AD fully as of yet. I look forward to seeing what D-Link does in this class. Maybe @CES 2017.
My two cents.